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    Wyświetlanie 1-37 z 37
    Tytuł:
    Portal prezentujący kościonośny kajper Górnego Śląska w świetle wyników grantu N307 11703
    The website presenting the bone-bearing Keuper of Upper Silesia, based on the research results of the grant N307 11703
    Autorzy:
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075737.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    górny trias
    kajper
    Górny Śląsk
    stratygrafia
    kręgowce
    historia geologii
    Upper Triassic
    Keuper
    Upper Silesia
    stratigraphy
    vertebrate sites
    history of geology
    Opis:
    The major goal of the project “The evolution of terrestrial environments of the Upper Silesian Keuper as biotopes of vertebrates”, granted for Grzegorz Racki by the Ministry of Science and Higher Education (2009-2013), was an exhaustive, integrated study of the bone-enriched middle Keuper interval in terms of stratigraphy, sedimentology, mineralogy and geochemistry. The new website “Bone-bearing Keuper of the Upper Silesia, southern Poland” (http://www.ing.pan.pl/Keuper/Bone-bearing_Keuper-1.htm)presents in English the results of this project. The significant achievements are only a starting point to a comprehensive presentation of the complex Keuper themes, jointly with an extensive repository of regional literature (above 420 full-texted publications since 1790). In addition, the main results of the grant, as well as diversity of their implications for future studies are summarized herein, with emphasis on controversial geochronological aspects in vertebrate paleontology (how many bone-rich levels?), and in a broad historical context.
    Źródło:
    Przegląd Geologiczny; 2017, 65, 5; 275--281
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influential Polish publications in sedimentary geology 1996-2016
    Autorzy:
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059868.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    sedimentary geology
    hot papers
    citation analysis
    Polish geology
    Opis:
    The list of thirty highest cited recent Polish publications (after 1995) on diverse themes resulted from study of sedimentary rocks, usually referred as sedimentary geology, is presented. The progressively successful fields include in first order large-scale palaeogeographic and lithofacies analyses in supra-regional geotectonic framework (by Golonka), and also tectonic-regional varieties of basin analysis, developed by several research groups in Cracow, Warsaw and Wrocław, in agreement with one of the leading research front in worldwide geosciences. Ecological and Integrative stratigraphic-event characteristics of sedimentary successions are another well-known Polish specialties, the best exemplified by flysch ichnology (Uchman) and Devonian studies at University of Silesia. On the other hand, sedimentary geochemistry is still in infancy in Poland, despite a big progress in last years (in particular organic topics - Marynowski). The dominance of Cracow geological school is obvious, derived from a long-lasting tradition of mostly Carpathian studies in Jaggielonian University, even if this research is well advanced as well in many other institutions in Poland. For example, a newly emerging Polish specialty in tsunami hazard studies (Szczuciński) is markedly located at Adam Mickiewicz University. Nevertheless, Carpathian and post-Palaeozoic stratigraphic-sedimentological themes were still the most popular, although simultaneously an evolution toward effective cooperation in largely international groups (also outside of Poland, especially in Ukraine) appears to be the most significant tendency in modern Polish geosciences.
    Źródło:
    Geological Quarterly; 2016, 60, 2; 537--546
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ewolucja środowisk lądowych kajpru Górnego Śląska jako biotopów kręgowców-nowy projekt badawczy
    Evolution of Late Triassic terrestrial do permsko-triasowych stanowisk as vertebrate habitats-a new research project
    Autorzy:
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2066276.pdf
    Data publikacji:
    2010
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    biotopy kręgowców
    Górny Śląsk
    vertebrate habitats
    Upper Silesia
    Źródło:
    Przegląd Geologiczny; 2010, 58, 2; 124-126
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Frasnian-Famennian brachiopod extinction events: A preliminary review
    Autorzy:
    Racki, G
    Powiązania:
    https://bibliotekanauki.pl/articles/20065.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Pentamerida
    fauna
    China
    America
    Palmatolepis rhenana
    Atrypida
    morphology
    mass extinction
    Ural Mountains
    taxonomy
    Brachiopoda
    Famennian
    Frasnian
    brachiopod
    Devonian
    Kellwasser Crisis
    biogeography
    biostratigraphy
    distribution
    paleontology
    Opis:
    Preliminary review of taxonomy of the brachiopod order Atrypida and its stratigraphic distribution in the late Frasnian Kellwasser Crisis of several regions of Laurussia, western Siberia and South China point to their moderate diversity and stepdown but irregular extinction pattern. The distinctive character of the late Frasnian atrypid fauna is emphasised by several relict genera, marked by recurrent and possibly aberrant characters (mainly in ornamentation types), tendency to size reduction and homeomorphy in some taxa. The transgressive/hypoxic Lower Kellwasser Event and preceding eustatic changes during the Palmatolepis rhenana Zone had only a regional destructive effect, and were linked rather to an enhanced dispersal of the last generic set of atrypids. The Variatrypinae, Spinatrypinae and Iowatrypa-group seem to belong to the latest surviving atrypids. The final demise of the remaining atrypids (and some other articulate brachiopods, e.g., gypidulids) coincided with the transgressive/hypoxic Upper Kellwasser Event, followed by catastrophic eustatic fall during the late Palmatolepis linguiformis Zone (F-F Event). This was probably exacerbated by accelerated submarine volcano-hydrothermal activity, and consequent progressive regional eutrophication, and climatic destabilization. The level-bottom rhynchonellid-inarticulate biofacies crosses the fatal F-F boundary horizon without major changes. No reliable data exist for the presence of atrypids in the Famennian survival and recovery biota, even for the smooth lissatrypid Peratos. Sustained competition from radiating and diversifying productid-cyrtospirifrid-athyrid faunas may have provide an additional biotic factor in the collapse of the Frasnian shelly benthos at the time of sfress, as well as in a post-extinction offshore repopulation from inner shelf habitats.
    Źródło:
    Acta Palaeontologica Polonica; 1998, 43, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Alvarez impact theory of mass extinction; limits to its applicability and the "great expectations syndrome"
    Autorzy:
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/20155.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Alvarez impact theory
    mass extinction
    great expectation syndrome
    bolide impact
    extraterrestrial marker
    impact crater
    Cretaceous
    Paleogene
    Triassic
    Jurassic
    Frasnian
    Famennian
    boundary
    Opis:
    For the past three decades, the Alvarez impact theory of mass extinction, causally related to catastrophic meteorite impacts, has been recurrently applied to multiple extinction boundaries. However, these multidisciplinary research efforts across the globe have been largely unsuccessful to date, with one outstanding exception: the Cretaceous–Paleogene boundary. The unicausal impact scenario as a leading explanation, when applied to the complex fossil record, has resulted in force−fitting of data and interpretations (“great expectations syndrome”). The misunderstandings can be grouped at three successive levels of the testing process, and involve the unreflective application of the impact paradigm: (i) factual misidentification, i.e., an erroneous or indefinite recognition of the extraterrestrial record in sedimentological, physical and geochemical contexts, (ii) correlative misinterpretation of the adequately documented impact signals due to their incorrect dating, and (iii) causal overestimation when the proved impact characteristics are doubtful as a sufficient trigger of a contemporaneous global cosmic catastrophe. Examples of uncritical belief in the simple cause−effect scenario for the Frasnian–Famennian, Permian–Triassic, and Triassic–Jurassic (and the Eifelian–Givetian and Paleocene–Eocene as well) global events include mostly item−1 pitfalls (factual misidentification), with Ir enrichments and shocked minerals frequently misidentified. Therefore, these mass extinctions are still at the first test level, and only the F–F extinction is potentially seen in the context of item−2, the interpretative step, because of the possible causative link with the Siljan Ring crater (53 km in diameter). The erratically recognized cratering signature is often marked by large timing and size uncertainties, and item−3, the advanced causal inference, is in fact limited to clustered impacts that clearly predate major mass extinctions. The multi−impact lag−time pattern is particularly clear in the Late Triassic, when the largest (100 km diameter) Manicouagan crater was possibly concurrent with the end−Carnian extinction (or with the late Norian tetrapod turnover on an alternative time scale). The relatively small crater sizes and cratonic (crystalline rock basement) setting of these two craters further suggest the strongly insufficient extraterrestrial trigger of worldwide environmental traumas. However, to discuss the kill potential of impact events in a more robust fashion, their location and timing, vulnerability factors, especially target geology and palaeogeography in the context of associated climate−active volatile fluxes, should to be rigorously assessed. The current lack of conclusive impact evidence synchronous with most mass extinctions may still be somewhat misleading due to the predicted large set of undiscovered craters, particularly in light of the obscured record of oceanic impact events.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Brachiopod assemblages in the Devonian Kowala Formation of the Holy Cross Mountains
    Autorzy:
    Racki, G
    Powiązania:
    https://bibliotekanauki.pl/articles/20858.pdf
    Data publikacji:
    1992
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    spiriferidy
    Gory Swietokrzyskie
    fauna
    atrypidy
    skamienialosci
    Ambocoeliidae
    Polska
    paleontologia
    ramienionogi
    dewon
    Opis:
    Brachiopod faunas from the Devonian stromatoporoid-coral series (Kowala Formation) of the southern Holy Cross Mts comprise at least 60 species, atrypids and ambocoeliid spiriferids being the most common. Largely monospecific bottom-level pioneer assemblages colonized intershoal and open shelf environments of the Late Givetian Sitkówka bank complex to the Frasnian Dyminy reef complex, and some lagoonal habitats of the older Givetian Stringocephalus bank. The associations dwelling organic buildups were more diverse and specialized. Faunal dynamics of the brachiopods were controlled primarily by eustatic cycles and the evolution of the carbonate shelf. Generally this was a four-step succession from the stringocephalid to the ambocoeliid, atrypid (or cyrtospiriferid), and rhynchonellid faunas. Twenty two species are reviewed,Praewaagenoconcha(?) sobolevi sp. n., Desquamatia globosa aequiconvexa subsp. n., and D. g. sitkowkensis ssp. n. are proposed. Two poorly-known species of Gürich (1896), Tenticospirifer lagoviensis and Ilmenia(?) elatior, are redescribed.
    Fauna ramienionogowa z dewońskiej serii stromatoporoidowo-koralowcowej (Formacji z Kowali) południowej części Gór Świętokrzyskich zawiera co najmniej 58 gatunków. Atrypidy i spiriferidy Ambocoeliidae są najbardziej szeroko rozpowszechnione. Slabo zróżnicowane, często jednogatunkowe pionierskie zespoły poziomu dna („level-bottom”) kolonizowały otwartomorskie i śródpłyciznowe środowiska późnożyweckiego sitkówczańskiego kompleksu ławicowego („bank complex”) i dymińskiego kompleksu rafowego franu, jak i niektóre lagunowe biotopy stringocefalowej ławicy biostromalnej starszego żywetu. Asocjacje zamieszkujące budowle organiczne były bardziej zróżnicowane i wyspecjalizowane. Dynamika faunistyczne ramienonogów była kontrolowana w pierwszym rzędzie przez cykle eustatyczne i evolucję środowiskową szelfu węglanowego. Generalnie była to cztero-etapowa sukcesja od fauny stringocefalowej przez ambocelidową, atrypidową i (lub) cyrtospiriferidową po rynchonellidową. Dwadzieścia dwa gatunki są przedstawione, a z nich Praewaagenoconcha(?) sobolevi sp. n. i 2 podgatunki Desquamatio, globosa (aequiconvexa i sitkowkensis) zaproponowano jako nowe. Nadto, opisano 2 słabo poznane gatunki Güricha (1896), Tenticospirifer lagoviensis i Ilmenia(?) elatior.
    Źródło:
    Acta Palaeontologica Polonica; 1992, 37, 2-4; 297-357
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolution of the bank to reef complex in the Devonian of the Holy Cross Mountains
    Autorzy:
    Racki, G
    Powiązania:
    https://bibliotekanauki.pl/articles/22471.pdf
    Data publikacji:
    1992
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    faza eifelska
    wymieranie gatunkow
    konodonty
    skamienialosci
    Polska
    zywet
    ruchy tektoniczne
    bentos
    ramienionogi
    koralowce
    Gory Swietokrzyskie
    eifel
    ruchy eustatyczne
    stratygrafia
    rafy koralowe
    paleontologia
    fran
    dewon
    Opis:
    Givetian and Frasnian stromatoporoid-coral limestone of the Kowala Formation in the southern Holy Cross Mts is subdivided stratigraphically, and correlated with strata elsewhere on the basis of identified sea-level cyclicity, with support from conodonts and other selected benthic fossils. After the Eifelian hypersaline sabkha phase, an extensive two-step regional colonization of the Kielce Region carbonate platform took place during the Eifelian/Givetian passage interval and the Middle Givetian. At least four deepening pulses resulted in intermittent drowning of the vast carbonate platform and sequential replacement of the undifferentiated Stringocephalus biostromal bank by the Sitkówka bank complex and, subsequently, by the Dyminy reef complex. The reef developed in the central Dyminy belt as result of the early Frasnian accelerated sea-level rise after some period of biotic stagnation near the Givetian-Frasnian boundary. Final demise of the reef resulted from combined eustatic and tectonic movements during the late Frasnian major crisis interval.
    Żywecko-frańska seria stromatoporoidowo-koralowcowa Formacji z Kowali w południowej części Gór Świętokrzyskich została podzielona stratygraficznie i skorelowana z innymi sekwencjami na podstawie cykli sedymentacyjnych o charakterze sekwencji spłycających się ku stropowi (shallowing upward). Datowanie podstawowych poziomów transgresywnych przez konodonty oraz wybrane skamieniałości bentoniczne (ramienionogi, koralowce) wskazuje, że cykliczność ta odzwierciedla głównie eustatyczne zmiany poziomu morza. Zakończenie eifelskiej fazy hypersalinarnej depozycji typu „sabkha” było przypuszczalnie wynikiem zmian klimatu na bardziej humidny i (lub) pulsów transgreswnych. Rozległa dwuetapowa kolonizacja platformy węglanowej Regionu Kieleckiego nastąpiła na pograniczu eiflu i żywetu oraz w środkowym żywecie. Co najmniej 4 pulsy pogłębień spowodowały skokowe zatapianie wielkiej platformy węglanowej i zastąpienie niezróżnicowanej stringocefalowej ławicy biostromalnej („biostromal bank”) przez sitkówczański kompleks ławicowy, a następnie - dymiński kompleks rafowy. Wymieranie pod koniec żywetu w regionie świętokrzyskim zachodziło w warunkach destabilizacji ekosystemu szelfowego przez raptowne zmiany eustatyczne. Późnożywecki zalew miał najbardziej rozległe skutki, powodując zatopienie części platformy oraz napływ nowej grupy gatunków ze strefy łysogórsko-kostomłockiej. Okres pewnej stagnacji biotycznej w interwale przejściowym żywetu i franu był urozmaicony jedynie zdarzeniem epejrogenicznym. Rzutowało ono m.in. na przejściową poprawę cyrkulacji wód i rozwój bardziej bogatych zespołów bentosu w śródpłyciznowym obszarze chęcińskim. Wzrost rafy w centralnej strefie dymińskiej byl efektem rosnącego tempa transgresji we wczesnym franie oraz dopływu trzeciej fali imigrantów, w tym unikatowej biocenozy kopców mułowych typu kadzielniańskiego oraz rafotwórczych zaspołów stromatoporoidów i cjanobakterii. Ostateczny upadek rafy był następstwem połączonych ruchów eustatycznych i tektonicznych, zintensyfikowanych w trakcie wielkiego kryzysu późnofrańskiego.
    Źródło:
    Acta Palaeontologica Polonica; 1992, 37, 2-4; 87-182
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Permian vertebrate tracks from the Tumlin Sandstone of Poland - a commentary on some major implications
    Autorzy:
    Racki, G
    Powiązania:
    https://bibliotekanauki.pl/articles/22453.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    terrestrial vertebrate
    Triassic
    Polska
    Permian
    Late Permian
    Holy Cross Mountains
    vertebrate
    paleontology
    Opis:
    The article by Ptaszyński and Niedźwiedzki (2004) on vertebrate tracks from the well−known Tumlin Sandstone provides important documentation of the unique terrestrial ichnofauna of the Holy Cross Mountains in Poland. However, two of the major conclusions of this paper raise my objections. The authors propose a new position for the Permian–Triassic (P–Tr) boundary within the Buntsandstein succession of the regional lithostratigraphical scheme. In a conclusion of global significance, the authors find no signature of a mass extinction in the Late Permian land−dwelling tetrapod communities. Both of these issues are reviewed below.
    Źródło:
    Acta Palaeontologica Polonica; 2005, 50, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Very large stromatoporoid indicating Early Frasnian reef core (Holy Cross Mts., Poland)
    Autorzy:
    Racki, G.
    Sobstel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058751.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Stromatoporoidea
    Dyminy Reef
    Frasnian
    Holy Cross Mountains
    Polska
    Opis:
    A large stromatoporoid Actinostroma cf. crassepilatum Lecompte, 1951, at least 8.5 m in diameter and 0.85 m in height, occurs in the Śluchowice quarry in Kielce, Holy Cross Mountains. This sponge occurs in growth position within Early Frasnian (transitans Zone) intraclast-rich reef-rubble deposits. A unique preservation of the reef-builder close to a reef core is implied for the northern flank of the developing Dyminy Reef during its maximum expansion northward into the Kostomłoty intrashelf basin.
    Źródło:
    Geological Quarterly; 2004, 48, 1; 83--88
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A rhynchonellid-dominated Late Famennian brachiopod assemblage from the Holy Cross Mountains (Poland)
    Późnofameński, zdominowany przez Rhynchonellida zespół ramienionogów z Gór Świętokrzyskich
    Autorzy:
    Biernat, G.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/23449.pdf
    Data publikacji:
    1986
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Late Famennian brachiopods are described for the first time from the Holy Cross Mts. (Góry Świętokrzyskie), Poland. Six taxa belong to two families, the Rhynchonellidae and the Cranaenidae; the new genus Pugnaria and three new species (Rozmanaria magna, Pugnaria plana and Cranaena lgaviensis) are proposed. The brachiopods are dominated by the smooth and comparatively large sulcate R. magna and the uniplicate P. plana. This macrobenthic assemblage, called Rozmanaria magna assemblage, is interpreted here as having successfully colonized deep-water habitats typical of the Chęciny-Zbrza intrashelf basin on the rising slope of the submarine ridge in the Kielce region.
    Późnofameńskie ramienionogi Gór Świętokrzyskich są niezbyt liczne i stosunkowo słabo poznane. W niniejszej pracy po raz pierwszy opisano ramienionogi późnofameńskie (? do III—IV) z synkliny gałęzickiej (głównie rejon Kowala—Bolechowice; fig. 1—8, pl. 35—46. Opracowana kolekcja jest liczna (220 okazów) a zespół zróżnicowany taksonomicznie. Udokumentowano występowanie sześciu taksonów należących do dwóch rodzin, Rhynchonellidae i Cranaenidae, przy czym zaproponowano jeden nowy rodzaj Pugnaria, i trzy nowe gatunki: Rozmanaria magna, Pugnaria plana i Cranaena Igaviensis. Zdecydowanie dominującymi elementami opisanej fauny są gładkie i stosunkowo duże rynchonellidy o zmiennie wykształconym fałdzie brzegu przedniego, R. magna (sinus w skorupce grzbietowej!) i P. plana (sinus w skorupce brzusznej). Występowanie form „przejściowych” tj. o prostym brzegu przednim (Pugnaria (?) sp.) świadczy, że sposobowi wykształcenia fałdu przedniego nie można przypisywać dużej wartości taksonomicznej. Opisana fauna została zinterpretowana jako zespół makrobentosu (zespół Rozmanaria magna) sukcesywnie zasiedlający stosunkowo głębokomorskie biotopy typowe dla chęcińsko-zbrzańskiego basenu wewnątrzszelfowego. W miarę spłycenia się basenu ku zachodowi, na skłonie podmorskiego grzbietu należącego do regionu kieleckiego, następowało pogarszanie się warunków rozwoju ramienionogów, wyrażone m.in. ich mniejszymi frekwencjami i spadkiem średniej wielkości skorupek.
    Źródło:
    Acta Palaeontologica Polonica; 1986, 31, 1-2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Frasnian Atrypida [Brachiopoda] from Poland and the Frasnian-Famennian biotic crisis
    Autorzy:
    Racki, G
    Balinski, A
    Powiązania:
    https://bibliotekanauki.pl/articles/20394.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    brachiopod fauna
    fauna
    Polska
    biotic crisis
    Atrypida
    mass extinction
    taxonomy
    Brachiopoda
    Famennian
    Frasnian
    Devonian
    Holy Cross Mountains
    biostratigraphy
    paleontology
    Opis:
    Late Frasnian Atrypida (Brachiopoda) from the Holy Cross Mountains, Poland, include 15 taxa and were widely distributed in foreslope habitats of the declining Dyminy Reef complex. The Palmatolepis semichatovae transgression, followed by the transgressive/hypoxic Lower Kellwasser (KW) Event during the Palmatolepis rhenana Zone did not have catastrophic effects for atrypid faunas, but were rather associated with the appearance of a new species group comprising Iowatrypa, Waiotrypa, Costatrypa, Spinatrypina, Desquamatia and Radiatrypa. Stepdown demise of the biota started during the inter-KW regression, and culminated as a result of increasing stress during the Upper Kellwasser Event in the late Palmatolepis linguiformis Zone, mainly due to catastrophic sea level changes and anoxia, possibly linked to oceanic thermal changes (cooling) and nutrification pulses. The extinction pattern was diachronous and facies-controlled in this area, and the last atrypid survivors reached the Frasnian-Famennian (F-F) boundary. Increasing expansion from the adjacent deeper-water environment of the more resistant assemblages, with productids, cyrtospiriferids, athyridids and schizophoriids, occurred in the final crisis interval. This brachiopod fauna profusion characterized the earliest Famennian survival and early recovery phases of the mass extinction in this part of the Laurussian shelf, as well as the continuity of the deeper-water rhynchonellid-inarticulate biofacies across the F-F boundary. Spinatrypina (Exatrypa) relicta sp. n. is proposed as new.
    Źródło:
    Acta Palaeontologica Polonica; 1998, 43, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formacja grabowska : podstawowa jednostka litostratygraficzna kajpru Górnego Śląska
    Grabowa Formation : the basic lithostratigraphic unit of the Upper Silesian Keuper
    Autorzy:
    Szulc, J.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075286.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    górny trias
    Górny Śląsk
    litostratygrafia
    formacja grabowska
    kręgowce
    Upper Triassic
    Upper Silesia
    lithostratigraphy
    Grabowa Formation
    vertebrate sites
    Opis:
    Lithostratigraphic division of the Upper Silesian Keuper continental succession belongs to abandoned matters, even if newly-discovered sites with unique vertebrate faunas highlight an increasing request to more precise designation of their stratigraphic setting. As a result of multidisciplinary grant and with a guide use of new borehole sections, a major lithostratigraphic unit is formally proposed for the middle Keuper (i.e., above the Schilfsandstein; Stuttgart Formation in Stratigraphische Tabelle von Deutschland, 2002), based on previously inaccurately used unit, Grabowa Formation of Bilan (1976). The re-defined Formation of Variegated Mudstones and Carbonates from Grabowa includes Upper Gypsum Beds and Steinmergelkeuper in traditional scheme from Germany (=Weser and Arnstadt Formations), and generally correlates with the Norian stage. Two bone-bearing horizons (Krasiejów and Lisowice) are placed within the unit, which is completely subdivided in three members: Ozimek (mudstone-evaporate), Patoka (marly mudstone-sandstone) and WoŸniki (limestone).
    Źródło:
    Przegląd Geologiczny; 2015, 63, 2; 103--113
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proliferation of abnormal palynoflora during the end-Devonian biotic crisis
    Autorzy:
    Filipiak, P.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059045.pdf
    Data publikacji:
    2010
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Devonian-Carboniferous transition
    mutation
    palynomorphs
    tetrads
    mass extinction
    volcanism
    Opis:
    The dispersed miospore assemblage of the Retispora lepidophyta-Verrucosisporites nitidus (LN) Zone from the Holy Cross Mountains(Poland) is marked by enrichment (above 4%) in abnormal spore morphotypes during a terrestrial flora turnover close to the Devonian-Carboniferous boundary, recorded just above the Hangenberg Black Shale level. Incomplete and complete tetrads represent mostly Vallatisporites spp., supplemented by Grandispora, Retusotriletes and Apiculiretusispora. Additional peculiar morphotypes, marked byanomalous overall shape and ornamentation, are interpreted as mutated varieties of Vallatisporites based on intermediate morphologicalstages, connecting them with this well known genus. This relatively high aberrant palynomorph frequency is accompanied by volcanicash intercalations, as well as by charcoal debris and polycyclic aromatic biomarkers indicative of forest wildfire. Thus, the anomalousspore morphology could reflect the mutagenic effect of regional acidification due to explosive volcanism. However, palynological literature data from NW France and Canada highlight the possibility of a supra-regional mutated miospore signal near the Devonian-Carboniferous boundary, and there is need for high-resolution studies of the LN Zone to examine this. The end-Permian scenario of abnormalfloral growth in immensely stressed habitats may therefore apply to other potentially volcanically-induced biotic turnovers.
    Źródło:
    Geological Quarterly; 2010, 54, 1; 1-14
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Givetian and Frasnian ostracod associations from the Holy Cross Mountains
    Autorzy:
    Malec, J
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/20585.pdf
    Data publikacji:
    1992
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    skamienialosci
    platykopidy
    Polska
    zywet
    Gory Swietokrzyskie
    Fellerites tuimazesis
    Microcheilinella fecunda
    paleokopidy
    podokopidy
    paleontologia
    Buregia jazwicensis
    fran
    dewon
    Opis:
    Variable bioclastic-biostromal-marly Posłowice facies within the Late Givetian open-shelf Jaźwica Member in the SW part of the Holy Cross Mts contain palaeocopid-podocopid ostracod associations of moderate diversity (18 species) dominated by Microcheilinella fecunda and Fellerites tuimazensis. More deepwater and stagnant environments of the Bolechowice micrite-marly facies, supported similarly differentiated (12 species) but less equitable associations with platycopids Uchtovia rejrathensis and palaeocopids Buregia jazwicensis as a main component. Other late Givetian, and Frasnian reef and lagoonal microfaunas are mostly impoverished (at least in generic terms) and strongly predominated by podocopids, mostly Bairdiocypris. Late Givetian associations from the Kostomłoty basin are marked by the metacopid Polyzygia symmetrica, and the planktic entomozoid Ungerella torleyi Polenovula beckeri sp. n., Clavofabellina poslovicensis sp. n., Buregia jazwicensis sp. n., and Bairdia zbikowskae sp. n. are proposed.
    Urozmaicona, detrytyczno-marglisto-biostromalna facja posłowicka w obrębie górnożyweckiego otwartomorskiego Ogniwa z Jaźwicy w południowo-zachodniej części Gór Świętokrzyskich wyróżnia się silniej zróżnicowaną (18 taksonów) asocjacją paleokopidowo-podokopidową, zdominowaną przez Microcheilinella fecunda i Fellerites tuimazesis. Natomiast bardziej głębokowodne, stagnujące biotopy, odpowiadające mikrytowo-marglistej facji bolechowickiej, były zasiedlone przez uboższą (12 gatunków) asocjację z platykopidami Uchtovia refrathensis i paleokopidami Buregia jazwicensis w rolach głównych. Inne późnożyweckie i frańskie rafowo-lagunowe mikrofauny są z reguły mało zróżnicowane rodzajowo i z bardzo dużym udziałem podokopidów, głównie z rodzaju Bairdiocypris; euryfacjalny gatunek B. samsonowiczi może być kluczem do korelacji wiekowej amfiporowych sekwencji lagunowych franu. Żyweckie asocjacje z zachodniej części basenu łysogórskiego charakteryzują się obecnością metakopidów, przede wszystkim Polyzygia symmetrica, oraz planktonicznych entomozoidów Ungerella torleyi. Nowe gatunki Polenovula beckeri sp. n., Clauofabellina poslovicensis sp. n., Buregia jazwicensis sp. n. i Bairdia zbikowskae sp. n. zostały opisane z Ogniwa z Jaźwicy.
    Źródło:
    Acta Palaeontologica Polonica; 1992, 37, 2-4; 359-384
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ichthyoliths and deepening events in the Devonian carbonate platform of the Holy Cross Mountains
    Autorzy:
    Liszkowski, J
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/23331.pdf
    Data publikacji:
    1992
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    fauna
    biotypy slodkowodne
    skamienialosci
    Polska
    zywet
    zrostoglowe
    ichtiolity
    Gory Swietokrzyskie
    akantody
    biotypy lagunowe
    kostnoszkieletowe
    promieniopletwe
    paleontologia
    fran
    plakodermy
    dewon
    ryby
    zarlacze
    Opis:
    Disarticulated fish microremains from the Middle Givetian to early Frasnian of the Holy Cross Mts include representatives of the most groups known from the Devonian: placoderms, elasmobranchs, holocephalians, acanthodians, osteichthyans (mostly osteolepidids) and actinopterygians. Taxonomic identifications are possible usually only in very general terms and only in two cases the generic level has been reached: Phoebodus among euselachians, and Moythomasia among paleoniscids. Many of these groups, regarded traditionally as typical dwellers of lacustrine to resticted marine nearshore biotopes, apparently flourished also in the offshore, open shelf carbonate (peri-reefl settings. The sequential replacement of the fish faunas was primarily influenced by eustatic events, in like manner to invertebrate communities.
    Zróżnicowane ichtiolity z pogranicza żywetu i franu Gór Świętokrzyskich obejmują przedstawicieli większości grup ryb znanych z dewonu takich jak plakodermy, żarłacze (m.in. rodzaj Phoebodus), zrosłogłowe, akantody, kostnoszkieletowe (głównie pospolite osteolepidy) i promieniopłetwe (w tym rodzaj Moythomasia). Dane z analizy ichtiolitów w znaczny sposób rozszerzają wyniki poprzednich badań opartych o makroskamieniałości i dokumentują wyraźne zmiany ewolucyjne (głównie wśród rekinów i paleoniscoidów) oraz ekologiczno-biogeograficzne w ciągu żywetu i franu. Wiele grup kręgowców, uważanych uprzednio za typowe dla biotopów słodkowodnych i lagunowych, zasiedlało również pełnomorskie środowiska otwartego szelfu, w tym te ściśle związane z rafami. Sukcesja asocjacji ryb była w dużej mierze kontrolowana przez fluktuacje eustatyczne w sposób zbliżony do rozpoznanego dla biocenoz bezkręgowców, tzn. epizody transgresywne były okazją do dużych migracji i zmian biogeograficznych, a interfazy regresywne - okresami stabilizacji bądź ubożenia fauny ryb.
    Źródło:
    Acta Palaeontologica Polonica; 1992, 37, 2-4; 407-426
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The bone–bearing Upper Triassic of Upper Silesia, southern Poland : integrated stratigraphy, facies and events – introductory remarks
    Autorzy:
    Racki, G.
    Szulc, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/191591.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 4; 553-555
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Frasnian Athyridida [Brachiopoda] from Poland and the Late Devonian biotic turnover
    Autorzy:
    Grunt, T A
    Racki, G
    Powiązania:
    https://bibliotekanauki.pl/articles/22601.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    phylogenesis
    brachiopod fauna
    Polska
    mass extinction
    Athyridida
    taxonomy
    athyridid
    Brachiopoda
    Famennian
    Frasnian
    Late Devonian
    Kellwasser Crisis
    Devonian
    biogeography
    Holy Cross Mountains
    biostratigraphy
    paleontology
    Opis:
    Late Frasnian representatives of the order Athyridida from the Holy Cross Mountains, Poland, support the idea that the Laurussian basins were the places of origin and radiation of the subfamilies Athyridinae and Meristinae during the middle and early late Paleozoic. At least three new species have been identified from two localities (Łgawa Hill and Kowala) in the Gałęzice Syncline. Of these, one was probaby endemic (Merista rhenanensis sp. n.; maybe also ?Zonathyris sp. A), and two (Athyris postconcentrica sp. n. and Pachyplaxoides postgyralea gen. et sp. n.) were more widely distributed in this part of the Laurussian shelf, being known also from the East European Platform and Rheinisches Schiefergebirge, respectively. This confirms an intermediate biogeographic position of the Holy Cross Mountains area, belonging to an important centre of brachiopod origin and diversification. In contrast to other articulate brachiopods, athyridids reveal a higher rate of diversification, especially at the species (and partly also generic) level, during the global Kellwasser Crisis.
    Źródło:
    Acta Palaeontologica Polonica; 1998, 43, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Givetian and Frasnian calcareous microbiotas of the Holy Cross Mountains
    Autorzy:
    Racki, G
    Sobon-Podgorska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/21904.pdf
    Data publikacji:
    1992
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    zielenice
    skamienialosci
    Polska
    zywet
    Trochiliscus
    Devonoscale
    Gory Swietokrzyskie
    kalcysferoidy
    glony
    stratygrafia
    Bevocastria
    paleontologia
    fran
    dewon
    wapienie
    mikroskamienialosci
    Opis:
    Each developmental phase of the Givetian to Frasnian carbonate complex of the southern Holy Cross Mts is marked by distinctive calcareous microbiota. The Stringocephalus bank deposits contain a very rich, well-preserved microproblematica (of chiefly ?algal origin) dominated by calcispheroids, and many calcified cyanobacteria and green algae with filamentous Bevocastria, tubiform Devonoscale, and charophyte Trochiliscus. In the late Givetian biostromal complex more sparse microfossil associations occur, with the exception of locally abundant semitextulariid foraminifera (mainly Nanicella) and tubiform dasyclad(?) Jansaella. Also in the Frasnian back-reef facies, only limited and poorly preserved calcispheroids are identified. Contrarily, reef- and fore-reef microbiotas were present in great profusion. Microbial mats (including calcified cyanobacteria Renalcis and Sphaerocodium), associated with locally frequent solenoporids and multichambered foraminifera (Nanicella, also many nodosariids in the later Frasnian) played a significant depositional role and evidence progressive shoaling conditions within the Dyminy reef-complex.
    Poszczególne fazy rozwojowe żywecko-frańskiego kompleksu węglanowego południowej części Gór Świętokrzyskich charakteryzują się specyficznym zespołem mikroskamieniałości wapiennych. Osady ławicy stringocefalowej zawierają szczególnie bogato reprezentowane i dobrze zachowane mikroproblematyki (?głównie pochodzenia glonowego) silnie zdominowane przez kalcysferoidy (kalcysfery i pokrewne „jednokomorowe otwornice”), szereg kalcyfikujących cjanobakterii i glonów zielenic, np. nitkowate Bevocastria, rurkowate Devonoscale oraz ramienice Trochiliscus. W poźnożyweckim kompleksie biostromalnym występuje bardziej uboga asocjacja mikroskamieniałości, poza miejscami licznymi semitekstularidami (głównie Nanicella), a zwłaszcza zielenicami (?Dasycladacae) Jansaella. Również z frańskich facji zarafowych znane są tylko mało zróżnicowane kalcysferoidy. Natomiast mikrobiocenozy rafowe i przedrafowe franu są bardzo bogate - przede wszystkim w cjanobakterie (np. kalcyfikujące formy Renalcis i Sphaerocodium), a miejscami też w solenoporidy i różnorodne wielokomorowe otwornice (Nanicella, w młodszym franie - nodozaridy). Odgrywały one znaczącą rolę biosedymentacyjną i dokumentują progresywne spłycanie biotopów kompleksu rafowego.
    Źródło:
    Acta Palaeontologica Polonica; 1992, 37, 2-4; 255-289
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biotic responses to the Late Devonian global events: Introductory remarks
    Autorzy:
    Balinski, A
    Olempska, E.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/21420.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    global event
    biotic response
    Late Devonian
    Devonian
    paleontology
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Siliceous biota [radiolarians and sponges] and the Late Devonian biotic crisis: The Polish reference
    Autorzy:
    Vishnevskaya, V
    Pisera, A.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/22703.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Astroentactinia stellata
    Trilonche nigra
    Polska
    biotic crisis
    Astroentactinia paronae
    Trilonche echinata
    mass extinction
    taxonomy
    Famennian
    Frasnian
    siliceous fauna
    Late Devonian
    Devonian
    Radiolaria
    carbonate shelf
    Holy Cross Mountains
    Trilonche grandis
    paleoecology
    distribution
    paleontology
    Opis:
    The radiolarian species Astroentactinia paronae, A. stellata, Trilonche echinata, T. grandis, T. nigra, Haplentactinia inaudita, and H. rhinophyuosa are common in late Frasnian to early Famennian rhythmic, calcareous−marly sequence of the southern Holy Cross Mts., Poland. They are known also from coeval abundant siliceous biota assemblages from the carbonate shelf of East European Platform including more than 150 taxa of radiolarians. However, in ecological terms, the moderately diverse Polish microfaunas (34 species of 12 genera) are more similar to these from Kolyma and Alaska, also marked by abundance of sphaerical entactiniids and near−absence of bilateral−symmetric Ceratoikiscidae and Palaeoscenididae. A succession of two distinctive siliceous sponges associations is established in the incipiently submerged Holy Cross carbonate platform: from an ephemeral, diverse, mostly rigid−skeletal lithistid−hexactinosan foreslope assemblage (initial phase of the late Frasnian Kellwasser Crisis), to long−lasting, basinal loose−skeletal hexactinellid−demosponge faunas (appearing abundantly just prior the Frasnian–Famennian boundary in the late Palmatolepis linguiformis Zone). Such regional blooms of marine siliceous biotas, parallel to temporary retreat of calcareous biota, are demonstrated worldwide for the Kellwasser Crisis. These suggest probable causal links with cooling pulses and at least regional, volcanically induced eutrophication.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Late Frasnian rhynchonellid genus Pammegetherhynchus [Brachiopoda] in Poland, and its relevance to the Kellwasser Crisis
    Autorzy:
    Sartenaer, P
    Racki, G
    Szulczewski, M
    Powiązania:
    https://bibliotekanauki.pl/articles/22719.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Pammegetherhynchus
    Polska
    mass extinction
    taxonomy
    Brachiopoda
    Rhynchonellida
    Frasnian
    Kellwasser Crisis
    Devonian
    Pammegetherhynchus kowalaensis
    rhynchonellid
    biostratigraphy
    paleontology
    Opis:
    The rhynchonellid species, Pammegetherhynchus kowalaensis sp. n., occurs in the late Frasnian (Early to Late Palmatolepis rhenana, and possibly early Palmatolepis linguiformis conodont zones) marly-bituminous succession at Kowala (various outcrops) in the Gałęzice Syncline, south of Kielce in the Holy Cross Mountains, Poland. The only other known species of this genus is the type species, Pammegetherhynchus merodae Sartenaer, 1977, from the late Frasnian (somewhere in the Early and Late Palmatolepis rhenana Zones) of the French Fagne (dark shales of 'Matagne' aspect), and, probably, of the Eifel ('Büdesheimer Goniatitenschiefer'). P. kowalaensis sp. n. occurred in level-bottom pioneer assemblages, thriving in reef downslope, mostly poorly-oxygenated habitats of the Kellwasser interval. The species finally disappeared near the Frasnian-Famennian boundary. The genus Pammegetherhynchus seems to be particularly suited to stressed deep-water shelf environments in the European part of the Laurussian shelf, widely distributed in this crisis time.
    Źródło:
    Acta Palaeontologica Polonica; 1998, 43, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anomalous Upper Devonian mercury enrichments : comparison of Inductively Coupled Plasma – Mass Spectrometry (ICP-MS) and Atomic Absorption Spectrometry (AAS) analytical data
    Autorzy:
    Racki, G.
    Rakociński, M.
    Marynowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060451.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Mercury anomalies
    analytical methods
    geochemistry
    Frasnian-Famennian boundary
    Devonian-Carboniferous boundary
    volcanism
    Opis:
    Mercury geochemistry is emerging recently as a hot topic in chemostratigraphical and facies research, owing to the diagnostic character of Hg enrichments as a proxy of volcanic activity (crucial in the context of assumed causal links between volcanic cataclysms and mass extinctions). Thus, as a prerequisite to such far-reaching interpretations, reliable analytical determinations of Hg concentrations are necessary. In conventionally performed analyses in sedimentary geochemistry, Inductively Coupled Plasma – Mass Spectrometry (ICP-MS) is usually applied, as an analytical standard for trace elements, including Hg. However, with a detection limit (DL) of 10 ppb, such measured values have been questioned as a conclusive geochemical indicator of Hg anomalies, and, instead, far more accurate techniques, such as Atomic Absorption Spectrometry (AAS; DL = 0.2 ppb), are requested. As a preliminary test of this view, we present comparative analysis of 91 samples from three sections encompassing the key Frasnian-Famennian and Famennian-Tournaisian boundary intervals in Morocco (Lahmida), Germany (Kahlleite) and Uzbekistan (Novchomok), for which Hg concentrations were determined by both methods in the same samples. Despite some differences, especially at low Hg concentrations, both analytical methods reveal the same 12 extraordinarily enriched samples in excess of 1 ppm (with one exception, the determination error is <20%), as well as similar overall chemostratigraphic patterns characterized by a few prominent Hg spikes, with a top value of 5.8 ppm. The Hg concentrations determined by ICP-MS and AAS are significantly correlated, as high as r = 0.98 (Novchomok), even if the first method reveals a general tendency toward slightly heightened values (by ~15 to 30% for medians). Therefore, ICP-MS results can conclusively be used in mercury chemostratigraphy in order to recognize extraordinary volcanic (or other) signals, at least in the Devonian geological record. False Hg anomalies were not generated by these conventional ICP-MS determinations.
    Źródło:
    Geological Quarterly; 2018, 62, 3; 487--495
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early-Middle Frasnian transition: Biotic response to a major perturbation of the global carbon budget
    Autorzy:
    Balinski, A
    Olempska, E.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/22463.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Early-Middle Frasnian
    Frasnian
    biotic response
    perturbation
    global carbon budget
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 4; 606-608
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conodont-based event stratigraphy of the Early-Middle Frasnian transition on the South Polish carbonate shelf
    Autorzy:
    Pisarzowska, A
    Sobstel, M.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/22673.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    conodont association
    stratigraphy
    Early-Middle Frasnian
    Frasnian
    Polska
    carbonate shelf
    biostratigraphy
    carbon isotope
    paleoecology
    Devonian
    Palmatolepis transitans
    Palmatolepis punctata
    Opis:
    Early to Middle Frasnian (E–MF) epicontinental sequences are investigated in five representative localities of the Holy Cross Mountains and Cracow region, with emphasis on conodont biostratigraphy, to evaluate the regional stratigraphic and biotic context of a major biogeochemical perturbation in global carbon cycling. Conodont associations from the Palmatolepis transitans to Palmatolepis punctata Zone boundary beds are dominated by the shallow−water polygnathid and ancyrodellid fauna in the South Polish epicontinental successions, and first appearances of index palmatolepid species are delayed due to facies control of pelagic environments during intermittent drowning of the carbonate shelf. Thus, identification of the zonal boundary is based mainly on species of Ancyrodella, and five distinctive ancyrodellid levels in the succession across the E–MF interval enable refined correlation of the sections studied, especially when paired with chemostratigraphic proxies. Prominent conodont biofacies shifts coincided with eustatic deepening, which is correlated with the Timan, Middlesex, and early Rhinestreet events, respectively. Trends in the conodont dynamics, mortality and diversity, partly replicated by the benthic biota (especially shelly faunas and crinoids), indicate that the faunal turnovers correlate also with the main δ¹³C excursions and related changes in trophic conditions. The E–MF transitional interval, marked by short−term sea−level fluctuations, is distinguished by a change from relatively diversified biofacies to more homogenous, mostly impoverished faunas. The latter change is a biotic response to the beginning of a prolonged (ca. 0.5 Ma) positive δ¹³C anomaly, probably paired with unsteady eutrophic and partly anoxic regimes. The late Pa. punctata Zone negative carbon isotope anomaly is synchronous with the second large−scale pelagic biofacies remodelling, including mesotaxid extinction. A stabilization of the carbon cycle and its return to normal background values at the start of the Early Palmatolepis hassi Zone coincide with conodont biofacies diversification and recovery of reef−related biofacies. With the exception of collapsed, endemic Kadzielnia−type mud−mound biota and a moderate biodiversity depletion due to overall ecosystem stagnation, no significant extinction events can be demonstrated, even if the large−scale changes in carbon cycling during the E–MF timespan are of higher−amplitude than the celebrated carbon isotopic anomalies related to the Frasnian–Famennian mass extinction. Thus, this regional succession in detail confirms that the large−scale punctata Isotopic Event (= Pa. punctata Event) is correlated neither with catastrophic enviromental nor radical biotic changes.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 4; 609-646
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Key aspects of the stratigraphy of the Upper Silesian middle Keuper, southern Poland
    Autorzy:
    Szulc, J.
    Racki, G.
    Jewuła, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/191741.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    lithostratigraphy
    biostratigraphy
    disconformities
    bone beds
    Grabowa Formation
    middle Keuper
    Upper Silesia
    Opis:
    The stratigraphy of the Upper Silesian Keuper, a continental, mudstone-dominated succession is poorly known, although the already renowned, newly discovered vertebrate localities highlight the growing demand for a more precise intra-regional correlation and an appropriate stratigraphic reference framework. A major lithostratigraphic unit, preliminarily proposed for the middle Keuper (i.e., above the Schilfsandstein; Stuttgart Formation in “Stratigraphische Tabelle von Deutschland”, 2002) by Szulc and Racki (2015; Przegląd Geologiczny, 63: 103– 113), is described in detail. The redefined Grabowa Variegated Mudstone-Carbonate Formation, the unit previously based on inaccurately presented information, includes the Upper Gypsum Beds and the Steinmergel-keuper in the traditional scheme from Germany (= Weser and Arnstadt formations). Three members are formally defined: the Ozimek (Mudstone-Evaporite) Member, the Patoka (Marly Mudstone-Sandstone) Member and the Woźniki (Limestone) Member. Two significant bone-bearing horizons (Krasiejów and Lisowice) are placed within the Patoka Mbr. The formation thickness in a composite, regional reference section of the Upper Silesian Keuper, based on the new Woźniki K1 and Patoka 1 well profiles, is approximately 215 m thick. The Grabowa Fm generally correlates with the Norian stage, with the base located in the undefined upper Carnian, and is topped by a major, erosive disconformity and sedimentary sequence boundary, near the Norian-Rhaetian boundary. However, hiatuses in the Silesian middle Keuper succession are located and paired with a cannibalistic type of sand-mud flat deposition, largely controlled by Early Cimmerian movements of tectonic blocks associated with the Kraków–Lubliniec shear zone.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 4; 557-586
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conodont ecology in the Early-Middle Frasnian transition on the South Polish carbonate shelf
    Autorzy:
    Sobstel, M
    Makowska-Haftka, M.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/23066.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    conodont
    ecology
    Early-Middle Frasnian
    Frasnian
    Southern Poland
    carbonate shelf
    paleoecology
    Holy Cross Mountains
    deposit
    Palmatolepis transitans
    Palmatolepis punctata
    Opis:
    Well exposed Early–Middle Frasnian (E–MF, Palmatolepis transitans to Palmatolepis punctata zonal interval) deposits of the Holy Cross Mountains, in particular the reference Wietrznia section at Kielce, were studied in terms of conodont biofacies dynamics. Frequency of the conodont elements has been controlled mostly by depositional rate in hemipelagic muddy lithofacies and post−mortem gravity sorting during lateral redeposition in storm−generated, talus−like and encrinite layers. The conodont assemblages are dominated by a highly varying proportion of polygnathid, icriodontid, and ancyrodellid fauna. Major biofacies turnovers coincided with the deepening pulses corresponding to Timan, Middlesex, and early Rhinestreet global events. Trends in the conodont dynamics, mortality, and diversity point that the biotic shifts also coincide with the large−scale δ¹³C excursions as a record of changing trophic conditions during the major biogeochemical perturbation. A gradual decline of the Early Frasnian Ancyrodella reef−dwelling community correlates with the minor positive and succeeding larger negative δ¹³C excursion, and this is paired with a replacement by, mostly sparse, polygnathid and polygnathid−icriodontid biofacies, as well as with a short−term Belodella acme in mud−mounds areas. The distinctive habitat deterioration in pelagic and reef ecosystems is broadly correlative with the Domanik Crisis. The progressive biofacies unification is a conodont response to onset of the prolonged (ca. 0.5 Ma) δ¹³C enrichment, probably linked with high−stress life conditions due to eutrophication and partly anoxic regimes. A negative carbon isotope excursion in the late Pamatolepis punctata Zone is marked by the second major biofacies turning point during the Rhinestreet transgression, as recorded primarily in a final mesotaxid extinction, and highlighted also by decrease of conodont size and increased mortality of juveniles. After stabilization of δ¹³C values and a return to the background level across the Palmatolepis punctata–Palmatolepis hassi zonal transition, renewed biofacies diversification, in particular re−appearance of reef−related ancyrodellid fauna, took place. In addition, a large−scale migration event among palmatolepids and polygnathids during sea−level rise, mainly from the East European Platform, characterised this Middle Frasnian interval.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 4; 719-746
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Brachiopods and stratigraphy of the Upper Devonian (Frasnian) succession of the Radlin Syncline (Holy Cross Mountains, Poland)
    Autorzy:
    Baliński, A.
    Racki, G.
    Halamski, A. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/139163.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Devonian
    Frasnian
    stratigraphy
    carbon isotope stratigraphy
    punctata Event
    brachiopods
    Holy Cross Mountains
    dewon
    fran
    stratygrafia
    stratygrafia izotopowa węgla
    zdarzenie punctata
    ramienionogi
    Góry Świętokrzyskie
    Opis:
    The lower part of the Frasnian succession in the Radlin Syncline (Kielce–Łagów Synclinorium, southern region of the Holy Cross Mountains), in the two studied successions: Józefka at Górno and (for the first time) Radlin, consists of the rhythmic marly Szydłówek Beds, the fossil-rich limestones of the Wietrznia Beds (locally) and the atypically developed, calcareous Kostomłoty Beds. The carbon isotope chemostratigraphic pattern overall corresponds well to the global Early–Middle Frasnian biogeochemical perturbation, even if the major punctata positive excursion is only fragmentarily recorded in the Kostomłoty intrashelf basin. Two brachiopod assemblages are abundantly represented in both sections: the Phlogoiderhynchus polonicus Assemblage, typical of the Szydłówek Beds, and the Biernatella lentiformis Assemblage, limited to the middle part of the Wietrznia Beds. Both are highly dominated by the index species. Twenty nine lower Frasnian brachiopod species (Craniida – 1 species, Strophomenida – 1, Productida – 2, Protorthida – 1, Orthida – 5, Pentamerida – 1, Rhynchonellida – 4, Atrypida – 4, Athyridida – 3, Spiriferida – 4, Spiriferinida – 3) are described from the Szydłówek and Wietrznia Beds. Seven new species are introduced: Skenidioides cretus Halamski sp. nov., Biernatium minus Baliński sp. nov., Monelasmina montisjosephi Baliński sp. nov., Atryparia (Costatrypa) agricolae Halamski and Baliński sp. nov., Davidsonia enmerkaris Halamski sp. nov., Leptathyris gornensis Baliński sp. nov., and Echinocoelia parva Baliński sp. nov. Davidsonia enmerkaris Halamski sp. nov. is intermediate between Davidsonia Bouchard-Chantereaux, 1849 and Rugodavidsonia Copper, 1996 and is the youngest known representative of the suborder Davidsonioidea Copper, 1996. Skenidioides cretus Halamski sp. nov. is the last representative of the genus. Statistical investigation of a large sample of Spinatrypina (Exatrypa) explanata did not confirm the existence of two dimorphic forms, coarse- and fine-ribbed. The high-diversity Biernatella lentiformis Assemblage is quite dissimilar to coeval brachiopod assemblages described heretofore from the Holy Cross Mountains region. It is interpreted as consisting of mostly parautochthonous dwellers of deep-slope muddy habitats and a local, occasionally storm-agitated, intra-basin brachiopod-crinoid-coral shoal. The fauna was adapted probably to cooler and nutrient-poor waters during an initial phase of the severe carbon cycle perturbation.
    Źródło:
    Acta Geologica Polonica; 2016, 66, 2; 125-174
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emergence and extinction of the Givetian to Frasnian bryozoan faunas in the Kostomloty facies zone, Holy Cross Mountains, Poland
    Autorzy:
    Morozova, I P
    Weis, O.B.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/23384.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    stratigraphy
    fauna
    Frasnian
    Polska
    Devonian
    biogeography
    extinction
    Holy Cross Mountains
    taxonomy
    Bryozoa
    paleontology
    Givetian
    Opis:
    Devonian bryozoans have been investigated from two Givetian to Frasnian localities in the Holy Cross Mts (Central Poland), representing fossiliferous ramp slope facies of the Kostomłoty facies zone (north−western periphery of the Kielce carbonate platform). Thirteen genera belonging to four families and three orders have been identified. Bryozoans show close relation to previously described Givetian and Frasnian bryozoan faunas of France, but also some affinities to easterly regions (e.g., Kuzbass). The main immigration episodes are related to late Givetian and middle Frasnian deepening pulses. The replacement of locally rich and diverse Givetian carbonate bank faunas by overall impoverished Frasnian reef−complex associations largely corresponds to a major extinction event in the evolutionary history of Bryozoa. Five new species are described by I. Morozova and O. Weis: Eridotrypella arguta, Eridotrypella exserta, Eostenopora nimia, Primorella nitida, Primorella indigena.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The weathering-modified iridium record of a new Cretaceous–Palaeogene site at Lechowka near Chelm, SE Poland, and its palaeobiologic implications
    Autorzy:
    Racki, G.
    Michalski, M.
    Koeberl, C.
    Harasimiuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/20009.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cretaceous
    geochemical anomaly
    Lechowka n.Chelm
    Paleogene
    Polska
    anomaly
    biostratigraphy
    extinction
    geochemistry
    geological setting
    iridium
    lithology
    paleobiology
    paleontology
    weathering-modified iridium
    Opis:
    In the light of integrated biostratigraphic and geochemical data, a complete shallow−marine succession across the Cretaceous–Palaeogene (K–Pg) boundary, with the critical boundary clay coupled with a burrowed siliceous chalk (“opoka” in Polish geological literature), possibly equivalent of the basal Danian Cerithium Limestone in Denmark, has been discovered at Lechówka near Chełm, SE Poland. An extraterrestrial signature marking the K–Pg boundary is confirmed by anomalously high amounts of iridium (up to 9.8 ppb) and other siderophile elements (especially Au and Ni), as well as by an elevated Ir/Au ratio consistent with a chondrite meteoritic composition. The major positive iridium spike surprisingly occurs in Maastrichtian marls, 10 cm below the boundary clay interval, which can be explained by diagenetic mobilisation and re−concentration of the impact−derived components. Thus, intensively infiltrating, humic acid−rich ground waters during the long−lasting Palaeogene weathering in tropical humid regimes were probably responsible not only for the large−scale decalcification of the Lechówka section, but also for both downward displaced position of the iridium enrichment, a dispersed profile of this anomaly and its significantly lessened value, but still approaching an increase by a factor of 100. This modified record of the K–Pg boundary event points to a careful reconsideration of the iridium anomaly as a trustworthy marker for studying the extinction patterns across the K–Pg boundary, as supported by the recent data from New Jersey, USA.
    Źródło:
    Acta Palaeontologica Polonica; 2011, 56, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    How many Upper Triassic bone–bearing levels are there in Upper Silesia (southern Poland)? A critical overview of stratigraphy and facies
    Autorzy:
    Szulc, J.
    Racki, G.
    Jewuła, K.
    Środoń, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/191258.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    bone beds
    lithostratigraphy
    palynostratigraphy
    chemostratigraphy
    taphonomy
    Grabowa Formation
    middle Keuper
    Upper Silesia
    Opis:
    At least three widely separated bone-bearing intervals in the Upper Triassic succession of Upper Silesia, ranging in age from the Carnian to Rhaetian (i.e., in the interval of 25 Ma), are presented in papers by the Warsaw research group, led mainly by Jerzy Dzik and/or Grzegorz Niedźwiedzki. The stratigraphic arguments are reviewed for the vertebrate localities studied so far, in particular for the well-known middle Keuper sites at Krasiejów and Lipie Śląskie, to show that the previously proposed age assignments are still inadequately documented and questionable. This unreliability is exemplified by the evolving stratigraphic correlation of the fragmentary Silesian sections (8–18 m thick) with informal subsurface units from central-western Poland and with the German standard succession, ultimately not corroborated by comparison with the composite reference succession of the Upper Silesian Keuper, including new profiles (ca. 260 m thick) from the Woźniki K1 and Patoka 1 wells. Based on a multidisciplinary stratigraphic study covering consistent litho-, bio-, climato- and chemostratigraphic premises, focused on the regional reference section, two bone-bed levels only are recognized in the Patoka Marly Mudstone-Sandstone Member (= Steinmergelkeuper) of the Grabowa Formation, not very different in age (Classopollis meyeriana Palynozone; probably IVb Subzone): (1) the localized Krasiejów bone breccia level (early Norian in age) in the Opole region, and (2) the far more widely distributed Lisowice bone-bearing level (middle Norian) in a vast alluvial plain (braided to anastomosing river system) during the Eo-Cimmerian tectonic-pluvial episode. As a consequence of the principal uncertainties and controversies in Upper Triassic terrestrial stratigraphy, this is still a somewhat preliminary inference. Typical skeletal concentra- tions of a combined hydraulic/sedimentologic type, related to fluvial processes, are common in the Upper Silesian Fossil-Lagerstätten, although factors governing preservation are probably important, as well.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 4; 587-626
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geochemical and ecological aspects of lower Frasnian pyrite-ammonoid level at Kostomłoty (Holy Cross Mountains, Poland)
    Autorzy:
    Racki, G.
    Piechota, A.
    Bond, D.
    Wignall, P. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060630.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Holy Cross Mountains
    Frasnian
    pyritic fossils
    geochemical proxies
    anoxia
    Timan Event
    Opis:
    The lower Frasnian (transitans Zone with Ancyrodella priamosica = MN 4 Zone) rhythmic basin succession of marly limestones and shales (upper Szydłówek Beds) at Kostomłoty, western Holy CrossMts., Central Poland, contains a record of the transgressive-hypoxic Timan Event in this drowned part of southern Laurussian shelf. The unique facies consists of organic-rich marly shales and a distinctive pyritic, goniatite level, 1.6mthick. The faunal assemblage is dominated by pyritized shells of diminutivemollusks with cephalopods (including goniatites Epitornoceras and Acanthoclymenia), buchioline bivalves (Glyptohallicardia) and styliolinids. This interval is marked by moderately low Th/U ratios and pyrite framboid size distributions suggestive of dysoxic rather than permanent euxinic conditions. The scarcity of infauna and bioturbation resulted in finely laminated sedimentary fabrics, as well as the low diversity of the presumed pioneer benthos (mostly brachiopods). In the topmost part of the Szydłówek Beds, distinguished by the Styliolina coquina interbedded between limestone-biodetrital layers, the above geochemical proxies and C-isotope positive shift indicate a tendency to somewhat increased bottom oxygen deficiency and higher carbon burial rate linked with a bloom of pelagic biota during high-productivity pulse. The geochemical and community changes are a complex regional record of the initial phase of a major perturbation in the earth-ocean system during a phase of intermittently rising sea level in the early to middle Frasnian, and associated with the highest positive C-isotope ratios of the Devonian.
    Źródło:
    Geological Quarterly; 2004, 48, 3; 267--282
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palynology and microfacies of Lower Devonian mixed carbonate-siliciclastic deposits in Podolia, Ukraine
    Autorzy:
    Filipiak, P.
    Zaton, M.
    Szaniawski, H.
    Wrona, R.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/19979.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    palynology
    microfacies
    Lower Devonian
    Devonian
    carbonate-siliciclastic deposit
    Podolia
    Ukraine
    stratigraphy
    cuticle
    arthropod
    Opis:
    Investigation of mixed carbonate−siliciclastic Lower Devonian deposits have been carried out in the Ivanye Zolote and Ustechko sections in Podolia, Ukraine. Based on palynomorph evidence, the age of the samples studied is late Lochkovian, not older than the NM Oppel Miospore Zone, specifically the Si Lineage Zone. The presence of acritarchs and chitinozoans points to dominantly marine depositional conditions. However, a regressive environmental change toward more brackish conditions is indicated by a decrease in the taxonomic diversity of acritarchs in the topmost samples, the simultaneous disappearance of chitinozoans, and an increase in leiosphaerid frequency. Furthermore, evolution of limestone microfacies demonstrates a progressive transition from a shrinking marine basin toward a brackish, storm−affected muddy lagoon, manifested by recurrent profusion of impoverished, mostly opportunistic and euryhaline shelly benthos (nuculanid bivalves, leperditicopids and other ostracods, terebratulid brachiopods), chaetetid demosponges and diverse ichthyofauna. The association of plant (mainly nematophytes and some tracheids) and animal (eurypterid, ?scorpion, and possibly other arthropod) remains points to the presence of nearby Early Devonian wetland vegetation, providing food and shelter for various semi−aquatic and other terrestrial arthropods.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ostracods and fore-reef sedimentology of the Frasnian-Famennian boundary beds in Kielce [Holy Cross Mountains, Poland]
    Autorzy:
    Casier, J G
    Devleeschouwer, X.
    Lethiers, F.
    Preat, A.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/21725.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Famennian
    new ostracod
    Frasnian
    ostracod
    Polska
    sedimentology
    new species
    Ostracoda
    Holy Cross Mountains
    mass extinction
    Kielce town
    paleontology
    Opis:
    Four major microfacies have been recognized in the Psie Górki section and the bioclastic content indicates an open marine environment in the photic zone close to an algal shole. Sedimentological studies point to a regressive episode starting close to the Frasnian–Famennian boundary. The regressive microfacies pattern is revealed by the presence of semirestricted algal microbreccias that compose all of the lower part of the Famennian. The regression was accompanied by meteoric water invasion as the sea level fell. Seventy−six ostracod species are recorded. The ostracod assemblage, dominated by podocopids, belongs to the Eifelian ecotype and is indicative of a well−oxygenated marine environment below fair−weather wave base in the Frasnian part of the section, and of shallower environments in the base of the Famennian. No ostracod assemblage characteristic of hypoxic or semi−restricted water conditions has been recorded. The rate of extinction of ostracod species (>70%) close to the Frasnian–Famennian boundary is comparable with that known on the same level in several other sections investigated in the world. Five new ostracod species are proposed by J.−G. Casier and F. Lethiers: Selebratina vellicata, Samarella? minuta, Bairdiocypris ventrorecta, Acratia pentagona, and “Bairdia” psiegorkiensis.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Faunal dynamics across the Silurian-Devonian positive isotope excursions (delta13C, delta18O) in Podolia, Ukraine: Comparative analysis of the Ireviken and Klonk events
    Autorzy:
    Racki, G.
    Balinski, A.
    Wrona, R.
    Malkowski, K.
    Drygant, D.
    Szaniawski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/20924.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    fauna dynamics
    Silurian
    Devonian
    isotope excursion
    Podolia
    Ukraine
    comparative analysis
    Ireviken event
    Klonk event
    Brachiopoda
    Conodonta
    Chitinozoa
    carbon isotope
    oxygen isotope
    geochemistry
    Opis:
    Two global isotopic events, the early Sheinwoodian (early Wenlock) and that at the Silurian–Devonian transition, have been comprehensively studied in representative carbonate successions at Kytayhorod and Dnistrove, respectively, in Podolia, Ukraine, to compare geochemistry and biotic changes related correspondingly to the Ireviken and Klonk events. These two large−scale isotope excursions reveal different regional ecosystem tendencies. The well−defined increasing trend across the Llandovery–Wenlock boundary in siliciclastic input, redox states and, supposedly, bioproductivity, was without strict correlative relations to the major ¹³C enrichment event. The environmental and biotic evolution was forced by eustatic sea−level fluctuations and two−step climate change toward a glaciation episode, but strongly modified by regional epeirogeny movements due to location near the mobile Teisseyre−Törnquist Fault Zone. Thus, the global early Sheinwoodian biogeochemical perturbation was of minor depositional significance in this epeiric sea, as in many other Laurussian domains. Conversely, the Podolian sedimentary record of the Klonk Event exhibits temporal links to the abrupt δ¹³C anomaly, overprinted by a tectonically driven deepening pulse in the crucial S–D boundary interval. This carbon cycling turnover was reflected in the regional carbonate crisis and cooling episodes, paired with a tendency towards eutrophication and recurrent oxygen deficiency, but also with major storms and possible upwelling. Faunal responses in both Podolian sections follow some characters of the Silurian pattern worldwide, as manifested by conodont changeover prior to the major early Sheinwoodian isotopic/climatic anomaly. This contrasts with the relative brachiopod and chitinozoan resistances in the course of the Ireviken Event. Also, during the Klonk Event, a moderate faunal turnover, both in benthic and pelagic groups, occurred only near the very beginning of the prolonged ¹³C−enriched timespan across the system boundary, possibly due to progressive dysoxia and temperature drop. The characters point to a peculiarity of the Klonk Event by comparison with the Silurian global events, and some similarity already to the succeeding Devonian transgressive/anoxic episodes.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Frasnian-Famennian events in a deep-shelf succession, Subpolar Urals: biotic, depositional, and geochemical records
    Autorzy:
    Yudina, A B
    Racki, G.
    Savage, N.M.
    Racka, M.
    Malkowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/21692.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Famennian
    biotic record
    Frasnian
    geochemical record
    depositional record
    geochemistry
    Kellwasser crisis
    conodont
    biostratigraphy
    paleontology
    lithostratigraphy
    carbon isotope
    Opis:
    The Frasnian–Famennian (F–F) boundary is well biostratigraphically documented in the Palmatolepis−rich deposits exposed along the Syv’yu River in the lower slopes of the Subpolar Urals. The thin−bedded calcareous−clayey−siliceous deep−slope succession of the Vorota Formation appears to represent continuous Domanic−type deposition throughout the world−wide carbonate crisis time, without evidence for the basal Famennian hiatus or a large−scale sedimentary perturbation within a regressive setting. The northernmost Laurussian sequence exhibits many well known signatures throughout the broad F–F timespan: the appearance of organicand clay−rich deposits, icriodontid and radiolarian blooms, and a correlative shift of several geochemical proxies towards hypoxic and high−productivity regimes, perfectly recorded by positive 13Ccarb excursions of +3.5‰. Integrative biotic, microfacies and geochemical data substantiate a longer−term oceanographic destabilization, attributable to multiple Earth−bound triggering factors in (episodically enhanced?) greenhouse climate and punctuated eustatic sea−level highstands, superimposed on the elevated deposition of organic carbon−rich sediments during the Upper Kellwasser Event. Unsteady eutrophicated, and oxygen−depleted ecosystems during the F–F biotic crisis interval could be assumed, especially when intensified by various spasmodic tectono−volcanic phenomena in the incipiently closing Ural Ocean.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative oxygen and carbon isotopic records of Miocene and recent lacustrine unionid bivalves from Poland
    Autorzy:
    Błażejowski, B.
    Racki, G.
    Gieszcz, P.
    Małkowski, K.
    Kin, A.
    Krzywiecka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060015.pdf
    Data publikacji:
    2013
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    sclerochronology
    stable isotopes
    fresh water
    Miocene and recent Unionidae
    Bełchatów
    Gil Wielki Lake.
    Opis:
    The δ13C and δ18O isotope data from both fossil (Miocene) and modern freshwater bivalve shells of family Unionidae from Poland (species Margaritifera flabellatiformis and Unio tumidus, respectively) show a similar, truncated sinusoidal pattern.. The isotopic profiles of the whole shell are visibly marked by three growth stages, linked with a progressive loss of environmental record because of declining intra-annual biocarbonate accretion rate. The juvenile and gerontic phases exhibit generally more positive and stable (plateau) isotopic pattern than the mid-age stage. An increasing δ13C trend is typical for the final life stage, likely influenced by nutrient overloading, reversing the tendency towards δ13C depletion throughout the individual’s life induced by metabolic processes. Due to the progressive loss of environmental signals through ontogeny, these initial and final isotopic profile segments probably correspond to, respectively, an instant signature of the first season growth, and a multiyear value set of summer maxima during geriatric stage. Vague seasonal cyclic record is the striking feature of the mid-age δ18O and δ13C profile slices. In case of low-amplitude δ18O curve, this is probably promoted by a sensitivity of the lake ecosystem to many dynamic intra-annual factors affecting water budget balance. This consistent signature mode seems to be typical for lake-dwelling unionid shells at least since Miocene from different climatic zones, as confirmed by coeval lacustrine low-latitude mussels from Amazonia. Thus, this isotope record is relevant to obtain information on the habitat and life cycle of the fossil freshwater bivalves, as well as could help understand modern environmental change.
    Źródło:
    Geological Quarterly; 2013, 57, 1; 113--122
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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