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    Wyświetlanie 1-8 z 8
    Tytuł:
    Polish Polar Research as a medium of international scientific communication 1996 -2002
    Autorzy:
    Racki, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2052103.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Polish Polar Research
    scientific communication
    bibliometrics
    journal impact factor
    citation indicators
    Źródło:
    Polish Polar Research; 2002, 23, 3-4; 279-292
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wielkie wymierania i ich przyczyny
    Mass extinctions and their causes
    Autorzy:
    Racki, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1196002.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Opis:
    Mass extinctions are relatively brief interval of geologic time distinguished by a distinctive increase in the extinction rate experienced by more than one geographically wide-spread higher taxon, resulting in a transient drop of the global biodiversity (and several other ecosystem perturbations, including carbon cycling). Macroevolutionary role of the catastrophic events has attracted an enormous attention, but this is involved in many highly controversial natters. The incompleteness and biases of the fossil record are comprehensively discussed recently for the global diversity statistics, but, as shown by sampling standardization and more reliable counting strategies, they do not essentially obscure recognizing peaks of extinction rate. On the other hand, other metrics of past loss of evolutionary history are requested, as well as more common application of phylogenetic approaches. Information on biological selectivity must be combined with regional environmental and geographic patterns to indentify the actual complexity of extinction events and ways of the ecosystem recovery, also in the context of ongoing biodiversity crisis promoted by the anthropogenic greenhouse effect. Even the "big five" mass extinctions are certainly heterogeneous group in effect and in cause, and primary kill mechanisms are still conjectural. Volcanic greenhouse scenario, with a stimulating role for CO2 emissions and release of methane from gas hydrate reservoirs due to the eruption of large igneous provinces, seems to be an emerging paradigm in place of so previously highlighted impact theory. Volcanism → global warming → oceanic anoxia → mass extinction model is therefore currently seen as a main determining factor in the biosphere history.
    Źródło:
    Kosmos; 2009, 58, 3-4; 529-545
    0023-4249
    Pojawia się w:
    Kosmos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comment on “An early Late Triassic long-necked reptile with a bony pectoral shield and gracile appendages” by Jerzy Dzik and Tomasz Sulej
    Autorzy:
    SZULC, JOACHIM
    RACKI, GRZEGORZ
    BODZIOCH, ADAM
    Powiązania:
    https://bibliotekanauki.pl/articles/945248.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Źródło:
    Acta Palaeontologica Polonica; 2017, 62, 2; 287-288
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Habitats in the Pre-Taghanic (Givetian, Middle Devonian) muddy carbonate ramp at Miłoszów (Holy Cross Mountains, Poland) : geochemical and microfacies evidence
    Autorzy:
    Pisarzowska, Agnieszka
    Racki, Grzegorz
    Rakociński, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2177463.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    carbon isotope chemostratigraphy
    elemental geochemistry
    limestone microfacies
    carbonate ramp
    Skały Formation
    Middle Devonian
    Łysogóry Region
    Holy Cross Mountain
    Opis:
    The well-known fossiliferous and lithologically variable Middle Devonian Shaly-Calcareous Skały Formation in the Łysogóry Region (northern part of the Holy Cross Mountains, central Poland) was studied for the first time in terms of elemental geochemistry, carbon isotope stratigraphy and limestone microfacies. Three Lower to Middle Givetian marly-limestone successions, exposed at Miłoszów, represent middle to outer facies belts of the vast carbonate ramp, characterized by very rich epifaunal and infaunal benthic life in muddy, oxic, eutrophic, and photic zone habitats. Brachiopods and occasionally corals (in mesophotic association), erect branching bryozoans, and tiny crinoids played a leading role among flourishing sessile suspension-feeders. High-energy storm events, possibly even a tsunami, during the brief Early Givetian time strengthened a prolific carbonate ooze delivery system from shallow ramp areas, including restricted back-ramp lagoons and a variety of organic buildups, populated by corals and stromatoporoids. The ecologically mixed skeletal grain association is characterized by the rich occurrence of a typical lagoonal biota, calcispheres and amphiporoids. The effective carbonate factory declined stepwise regionally during the Middle Givetian because of an intermittent progradation of the deltaic system of the Świętomarz Beds, linked with climate cooling and the activation of block movements. The regional carbonate crisis resulted in the demise of diverse benthic life, including the prolific calcified microbiota. The higher Skały Formation succession, deposited between the important Kačák and Taghanic bioevents, is noticeable for a background carbon-isotope pattern in carbonate and organic matter signatures, with the baseline δ13Ccarb values between 1‰ and 2‰. The microfacies and chemostratigraphic data confirm that at least the lower pumilio bioevent was not recorded in the Łysogóry Region.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2022, 92, 4; 381--409
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cyclic ecological replacement of brachiopod assemblages in the top-Eifelian Dobruchna Brachiopod Shale Member (Skały Formation) of the Holy Cross Mountains (Poland)
    Autorzy:
    Woźniak, Paweł
    Halamski, Adam T.
    Racki, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2182172.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Brachiopods
    palaeoecology
    Eifelian
    Kačák Event
    Skały Formation
    Devonian
    Holy Cross Mts
    Opis:
    The palaeoecology of fossiliferous shales, belonging to the upper part of the Dobruchna Brachiopod Shale Member (= set XIV) of the Skały Formation (northern Holy Cross Mountains), was studied quantitatively in a succession in the transient (1989) trench A, 5.6 m thick, near the village of Skały. The top-Eifelian strata, recording the carbonate crisis during the global Kačák Bioevent, are well known for having a particularly diverse brachiopod fauna. The four brachiopod assemblages, recognised herein, were mainly controlled by the evolving bottom-sediment properties of the outer carbonate ramp basin. Soft, unstable substrates were inhabited by the poorly-diversified Poloniproductus assemblage, associated with a distinctive, ‘incumbent’ set of largely semi-infaunal, generalist species. The pioneer community, as a result of progressive consolidation of bioclast-enriched sediment, evolved toward a more diverse biota. This consequent stabilisation of the substrate resulted in the progressive growth of crinoid thickets or bryozoan-dominated biostromes and patches, associated with rich, subordinate, sessile and vagile benthos. In this stage, diverse brachiopod assemblages were dominated by the pedunculate, eurytopic, ribbed spiriferide Eleutherokomma or specialized orthides (Aulacella, Costisorthis) in the Dobruchna Mbr, and by the expansive, large, free-lying orthotetide Xystostrophia in the overlying set XV of the Skały Fm The cyclic ecological replacement, with the characters of ecological succession in the final phase, was evidently stimulated by an irregular transition from soupy muds to a mosaic of bioclast-rich and firmer, biogenic sediments, within the cyclic pattern of distal tempestite sedimentation. The three episodes of variously reduced deposition rate, recorded in the more diverse benthos, culminated in the pioneer bryozoan/coral reef growth and abundance of epibionts, alternating with times of destructive storm activity and deposition from suspension clouds in the muddy habitats.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2022, 92, 4; 445--463
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Middle Devonian Skały Formation in the Holy Cross Mountains (Poland) : formal description and subdivision based on new field data
    Autorzy:
    Racki, Grzegorz
    Wójcik, Krystian
    Halamski, Adam T.
    Narkiewicz, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2182148.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    lithostratigraphy
    Skały Formation
    Dobruchna Member
    Middle Devonian
    Łysogóry Region
    Holy Cross Mts
    Opis:
    The well-known fossiliferous and lithologically variable clay-carbonate series in the Łysogóry Region (northern part of the Holy Cross Mts, central Poland), enclosed between the Middle Devonian Amphipora dolomites and limestones (Kowala Formation) and siliciclastics (Świętomarz Beds), is defined formally as the Shaly-Calcareous Skały Formation. This Upper Eifelian to Middle Givetian, ca. 250–280 m thick unit, consists of marly and clay shales, interbedded many times with various limestone types (including encrinite and biohermal varieties), as well as with marls and siltstones. Its diagnostic feature is the presence of variable skeletal accumulations, formed by exceptionally numerous, well-preserved and diverse macrofauna (including brachiopods, corals, crinoids, bryozoans), described since the 19th century. The stratotype is located in the eastern slope of the Dobruchna stream near the Skały village and belongs to the Silurian to Upper Devonian Grzegorzowice-Skały section. Compared to the previously used term, Skały Beds sensu Pajchlowa (1957), the lower boundary is redefined, owing to a new exposure in the active Skała Quarry, and placed higher, at the base of the famous brachiopod shales (set XIV of Pajchlowa), instead of the formerly accepted lower boundary at the base of set XIII. Set XIV is formally distinguished as the Dobruchna Brachiopod Shale Member. The higher part of the Skały Fm (sets XV–XXVA) is not subdivided further, as the poorly exposed succession, including in particular the type area, precludes a more accurate recognition of lithological variability. The upper boundary of the Skały Fm is placed at the top of set XXV sensu Pajchlowa (1957), corresponding to the boundary between subsets XXVA and XXVB sensu Malec and Turnau (1997). A hypostratotype of the upper boundary is selected in the outcrop M0 at Miłoszów, 2.5 km westwards from the type section, allowing recognition of the diachroneity of lithological change defining the transition from the Skały Fm to Świętomarz Beds. A borehole situated in a key location would be an obvious next step in the further elucidation of the stratigraphic sequence of the Łysogóry Region.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2022, 92, 4; 425--444
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Środowisko sedymentacji i domniemane źródło materiału detrytycznego w górnokredowej formacji red-bed Ashua (Peru)
    Depositional environment and probable source of detritus in the Upper Cretaceous red-bed Ashua Formation (Peru)
    Autorzy:
    Paulo, Andrzej
    Ciesielczuk, Justyna
    Racki, Grzegorz
    Żaba, Jerzy
    Gaidzik, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2075984.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    formacja Ashua
    późna kreda
    Peru
    osady krzemowe
    źródło piroklastyczne
    Ashua Formation
    Late Cretaceous
    siliciclastic deposits
    pyroclastic source
    Opis:
    Ashua Formation was deposited in Coniacian-Early Santonian time near shore of a shallow sea and in a plethora of continental arid environments. Its main component is fine-grained siliciclastic materialforming lithic and subordinate arkosic graywackes. Limestones are frequent in the lower member, and in the upper one gypsum and halite are present. Based on sedimentary textures and detailed petrographic studies, nine general microfacies were identified: shallow sea, beach, brackisch and mud flats, lagoon, sabkha and playa, deltaic, alluvial, mud flows, dunes at shoreline of an agitated water basin. The present authors suggest that the main source of detritus was pyroclastic deposits. They probably belong to the heavily eroded Lower Cretaceous Matalaque Formation.
    Źródło:
    Przegląd Geologiczny; 2019, 67; 189--191
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The pre-Taghanic (Givetian, Middle Devonian) ecosystems of Miłoszów (Holy Cross Mts, Poland)
    Autorzy:
    Halamski, Adam T.
    Baliński, Andrzej
    Racki, Grzegorz
    Amler, Michael R. W.
    Basse, Martin
    Denayer, Julien
    Dubicka, Zofia
    Filipiak, Paweł
    Kondas, Marcelina
    Krawczyński, Wojciech
    Mieszkowski, Radosław
    Narkiewicz, Katarzyna
    Olempska, Ewa
    Wrzołek, Tomasz
    Wyse Jacson, Patrick N.
    Zapalski, Mikołaj K.
    Zatoń, Michał
    Kozłowski, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2171821.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    stratigraphy
    palaeoecology
    biota
    biodiversity
    mesophotic
    deeper shelf
    climate
    carbonate
    Opis:
    The middle and upper parts of the Skały Fm, Early to Middle Givetian in age, were investigated in four sections at Miłoszów Wood in the Łysogóry Region (northern region of the Holy Cross Mountains, central Poland). The dating is based on conodonts (Polygnathus timorensis Zone to the later part of the Polygnathus varcus/Polygnathus rhenanus Zone; early Polygnathus ansatus Zone cannot be excluded) and spores (Ex1–2 subzones) and, coupled with cartographic analysis and geophysical investigation, allows correlation within the strongly faulted succession. Significant lateral facies variations within the carbonate ramp depositional system in comparison with the better studied Grzegorzowice–Skały section, about 3 km distant, are documented, thanks to conodont-based correlation of both successions. Foraminifers, fungi, sponges, rugose and tabulate corals, medusozoans, microconchids and cornulitids, polychaetes (scolecodonts), molluscs (bivalves, rostroconchs, and gastropods), arthropods (trilobites and ostracods), bryozoans, hederelloids, ascodictyids, brachiopods, echinoderms (mostly crinoids, rare echinoids, holuthurians, and ophiocistoids), conodonts, fish, plants (prasinophytes, chlorophycophytes, and land plant spores), and acritarchs are present. Brachiopods are the most diverse phylum present (68 species), other richly represented groups are bryozoans and echinoderms; in contrast, cephalopods and trilobites are low in diversity and abundance. The muddy, middle to outer ramp biota (200 marine taxa, including 170 species of marine animals, 22 photoautotrophs, 6 forams) represents a mixture of allochthonous shallower-water communities (upper BA3), including storm- and possibly tsunami-affected coral mounds, and autochthonous deep-water soft-bottom brachiopod (e.g., Bifida–Echinocoelia) communities (BA 4–5). The richness and diversity of the Miłoszów biota is relatively high, comparable with other approximately coeval pre-Taghanic ecosystems during the Devonian climatic deterioration (cooling). Preliminary data indicate that in the Holy Cross Mountains, no large-scale replacement of brachiopod (and probably many other benthic ones, like crinoids) communities took place between the Early–Middle Givetian and the Early Frasnian, in contrast to the demise of the Hamilton/Upper Tully fauna in the Appalachian Basin. Such a similarity of pre- and post-Taghanic faunas does not exclude the occurrence of environmental perturbations and transient community turnovers, caused by immigrations during the Taghanic Biocrisis, but evidences the successful recovery of the indigenous biota.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2022, 92, 4; 323--379
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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