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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:
3D morphology of post mortem acrothoracican borings in Famennian heterocorals : a morphological diversification or a continuum ichnospecies?
Autorzy:
Dworczak, Patrycja G.
Jarochowska, Emilia
López Correa, Matthias
Berkowski, Błażej
Powiązania:
https://bibliotekanauki.pl/articles/2171823.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
acrothoracican barnacles
Heterocoralia
bioerosion
Late Devonian
Morocco
Opis:
Barnacle borings were found in six heterocoral skeletons. They are present as small (up to 2.9 mm long), slender, pouch-shaped borings with tapering, slit-like openings. The investigated borings were made by acrothoracican cirripedes, which mostly do not have a shell and bore into hard substrates to protect their “naked” bodies. The first occurrence of borings in skeletons of the heterocoral Oligophylloides Różkowska, 1969 from the Upper Devonian Tafilalt Platform was reported recently by Weyer in 2016. Here, the authors present the results of a detailed study of heterocoral remains with numerous acrothoracican borings from Jebel Bou Ifarherioun (Famennian, Anti-Atlas, Morocco). The borings were found on the basal part but also on broken branches and stems of the heterocoral corallum and occurred post mortem. There is no indication of a syn vivo coral-barnacle interaction with borings in tissue-covered areas. The authors used micro-CT scans to visualize the 3D morphology of the pits, their orientation, and distribution. Additionally, the 3D morphology of an assemblage of 75 pits was used to carry out ordination and cluster analyses, which showed that previously proposed ichnospecies may be a continuum of morphological variability. In the basis of measurements by the present authors, the studied borings do not fit any known ichnotaxa. The absence of bourrelets excludes the possibility that the borings studied belong to the ichnogenus Rogerella Saint-Seine, 1951. Hence, the results seem to contradict a synonymization that was proposed by Bromley and D’Alessandro (1987) and subsequent authors and leave room for further research and discussion on this topic. Although the inferred boring organism is a filter feeder and, thus, depends on currents, the authors did not find a preferential orientation of the borings. The samples considered here are the best-preserved Devonian barnacle borings to date.
Źródło:
Annales Societatis Geologorum Poloniae; 2022, 92, 3; 233--252
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conodont biostratigraphy of the Frasnian-Famennian boundary in the Esfahan and Tabas areas, Central Iran
Autorzy:
Gholamalian, H.
Powiązania:
https://bibliotekanauki.pl/articles/2059517.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Iran
Late Devonian
Frasnian-Famennian boundary
biostratigraphy
conodonts
Opis:
The Frasnian-Famennian (F-F) boundary in Central Iran has been investigated on the basis of conodont faunas (34 species and subspecies) from four sections: Chahriseh near Esfahan, and Kal-e-Sardar, Howz-e-Dorah and Ghale-Kalaghu near Tabas. The F-F boundary in the Chahriseh section is located in a one-metre interval between beds EX1 and F-F9 whereas in the Kal-e-Sardar section it is at the base of bed Cly1. The F-F boundary can not be recognized in the Howz-e-Dorah and Ghale-Kalaghu sections be cause of uncon form able relation ships and erosion of the upper most late Frasnian beds indicated incidentally by reworked boulders (indicating con temporaneous tectonic activity) and by the abrupt appearance of contrasting environments, including tempestites at the base of the lower Famennian. The best conodont and palaeoenvironmental data were obtained from the Kal-e-Sardar section where a deeper marine environment prevailed during the late Frasnian, be coming shallower in the early Famennian; the Chahriseh section displays small fluctuations in sea level during the early Famennian. The conodont faunas display the inception of the Polygnathus communis group in the late Frasnian (rhenana-linguiformis zones) and the appearance of Icriodus alternatus mawsonae in the Late rhenana Zone. A new age-range is suggested for Polygnathus aequalis Klapper and Lane, from the transitans to the linguiformis zones. Three conodont biozones are represented in the late Frasnian to early Famennian of the Chahriseh section, two late Frasnian and one early Famennian in the Kal-e-Sardar section and two biozones in the late Frasnian and early Famennian of both the Howz-e-Dorah and Ghale-Kalaghu sections. Two new species are described: Polygnathus tabasianus (Early to Late crepida zones) and Polygnathus vachiki (Late rhenana-linguiformis zones).
Źródło:
Geological Quarterly; 2007, 51, 4; 453-476
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The mid-Famennian ammonoid succession in the Rhenish Mountains: the "annulata Event" reconsidered
Autorzy:
Korn, D.
Powiązania:
https://bibliotekanauki.pl/articles/2058845.pdf
Data publikacji:
2004
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Late Devonian
Famennian
Rhenish Mountains
Ammonoidea
black shales
diversity
Opis:
The mid-Late Devonian pelagic sedimentary successions of the Rhenish Mountains and other regions show a double black shale horizon called the annulata Black Shale. It marks, at the species level, a prominent faunal turnover of ammonoids from the Prolobites delphinus Zone into the Platyclymenia annulata Zone. An analysis of ammonoid genera distribution, phylogenetic relationships, andmorphospace occupation demonstrates that the "annulata Event" does not correspond to a crisis of the group and does not fulfill the criteria of a major biotic event.
Źródło:
Geological Quarterly; 2004, 48, 3; 245--252
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Późno dewońskie impakty
Late Devonian impacts
Autorzy:
Brachaniec, Tomasz
Brom, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1033026.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Frasnian-Famennian boundary
Late Devonian
Siljan crater
mass extinction
Opis:
In 1970 the first hypothesis, which claimed that large meteorite landed in ocean at Frasnian/Famennian boundary and caused mass extinction was proposed. In Late Devonian deposits there are many potential impact evidences. Nonetheless, many years of searching for iridium anomaly, shocked minerals, microtektites and craters in the F/F boundary passage deposits have failed. The most probably crater, which could be connected with F/F boundary is Siljan Ring in Sweden.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2015, 6; 34-37
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Frasnian-Famennian boundary in the Southern Urals
Autorzy:
Abramova, A. N.
Artyushkova, O. V.
Powiązania:
https://bibliotekanauki.pl/articles/2058836.pdf
Data publikacji:
2004
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Southern Urals
Late Devonian
Kellwasser Event
biostratigraphy
Barma Beds
brachiopods
Opis:
On the western slope of the Southern Urals, a continuous conodont zone sequence within different facies of the Frasnian-Famennian (F-F) boundary beds is documented. In all the sections the boundary between both stages runs within lithologically uniform successions and can be determined only by a sharp faunal change. In brachiopod facies, it is placed within brachiopod shell beds and relates to the base of the Barma Beds, i.e., the level marked by a simultaneous appearance of the index brachiopod species Pugnoides(?) markovskii and the zonal conodont species Palmatolepis triangularis. In goniatite facies, the F-F boundary can be traced by the disappearance of diverse Frasnian conodonts and goniatites of the genus Manticoceras, coupled with the first occurrence of the conodont Pa. triangularis; the sequence shows also the well-known icriodid blooms in the earliest Famennian. Finds of Famennian goniatites (representatives of the genus Cheiloceras) are confined to the crepida zones. In the sections of theWest-Zilair, where the F-F boundary passage consists of siliceous- terrigenous deposits, the boundary can be established only by a change in conodont assemblages. In all the sections under investigation the F-F boundary level shows a drastic faunal change that corresponds to the global Kellwasser Event.
Źródło:
Geological Quarterly; 2004, 48, 3; 217-323
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revision of latest Givetian-Frasnian Atrypida [Brachiopoda] from central North America
Autorzy:
Day, J
Copper, P
Powiązania:
https://bibliotekanauki.pl/articles/20627.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Late Frasnian
fauna
brachiopod fauna
Frasnian
Late Devonian
Devonian
Atrypida
taxonomy
North America
Givetian
Brachiopoda
paleontology
Opis:
The brachiopod fauna of the Middle-Late Devonian cratonic carbonate platform deposits of the Iowa Basin, central North America, contains twenty species of the order Atrypida, some of which are types for widespread genera common in Middle and Late Devonian faunas. The latest Givetian-early Frasnian deposits yield a diverse fauna consisting of ten species (two new) included in Desquamatia (Independatrypa), D. (Seratrypa), Pseudoatrypa, Radiatrypa, Spinatrypa (Spinatrypa) and Spinatrypina (Exatrypa). Many of these forms occur in, or are closely similar to species known from, coeval faunas of central and western Canada. Middle Frasnian deposits of northern Iowa contain two species included in Spinatrypa (S.) and Pseudoatrypa, both of which are new. Late Frasnian strata of the Iowa Basin yield eight species included in Costatrypa, Iowatrypa, Pseudoatrypa, and Spinatrypa (Spinatrypa), some of which are widespread in other subtropical and tropical faunas of the western US and western Canada. The taxa Pseudoatrypa witzkei sp. n., Spinatrypa (S.) bunkeri sp. n., Spinatrypa (S.) thompsoni sp. n., and Spinatrypina (Exatrypa) johnsoni sp. n. are proposed. Pseudoatrypa? sp. from the very late Frasnian of southern New Mexico is also illustrated.
Źródło:
Acta Palaeontologica Polonica; 1998, 43, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bryozoans from the Jurginskaya Formation (Famennian, Upper Devonian) of the Tom-Kolyvansk area (Western Siberia, Russia)
Autorzy:
Tolokonnikova, Zoya
Powiązania:
https://bibliotekanauki.pl/articles/94237.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Bryozoa
Late Devonian
Western Siberia
Russia
mszywioły
późny dewon
zachodnia Syberia
Rosja
Opis:
Nine bryozoan species are described from the Jurginskaya Formation (Famennian, Late Devonian) from Western Siberia, Russia, namely: Leptotrypella pojarkovi Orlovski, 1961, Rhombopora subtilis Nekhoroshev, 1977, Klaucena lalolamina Yang, Hu, Xia, 1988, Eofistulotrypa famennensis sp. n., Atactotoechus cellatus sp. n., Nikiforopora jurgensis sp. n., Eridotrypella tyzhnovi sp. n., Mediapora elegans sp. n., and Klaucena gracilis sp. n. The studied assemblage shows palaeogeographical affinity with Kazakhstan, Kirgizia, Transcaucasia, China, and the United States of America.
Źródło:
Geologos; 2010, 16, 3; 139-152
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stratigraphy, palynology and organic geochemistry of the Devonian-Mississippian metasedimentary Albergaria-a-Velha Unit (Porto-Tomar shear zone, W Portugal)
Autorzy:
Machado, G.
Francu, E.
Vavrdová, M.
Flores, D.
Fonseca, P. E.
Rocha, F. T.
Pereira, L. C. G.
Gomes, A.
Fonseca, M.
Chaminé, H.
Powiązania:
https://bibliotekanauki.pl/articles/2059150.pdf
Data publikacji:
2011
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Mississippian
Late Devonian
Ossa-Morena Zone
Porto-Tomar shear zone
palynology
organic geochemistry
Opis:
The Albergaria-a-Velha Unit is one of several tectonostratigraphic out-of-sequence units of the metamorphic belt associated with the Porto-Tomar shear zone (Ossa-Morena Zone, W Portugal). It is composed of considerably deformed - very low grade - metasediments, namely shales, siltstones and rare fine sandstones. In this work we present new sedimentological and biostratigraphical data that suggest the Albergaria-a-Velha Unit was deposited from the (?)early Frasnian to the Serpukhovian in a distal marine environment, where turbiditic and basinal sedimentation prevailed. Palynofacies analysis and lithological data point to a gradual increase of terrestrial input, suggesting a prograding system. Detrital framework data is indicative of a stable cratonic sediment source area composed of low grade metamorphic rocks. The timing of the onset of the Porto-Tomar shear zone activity and consequently its influence on the sedimentation of this unit is discussed. Organic petrology and geochemistry data indicate that the Albergaria-a-Velha Unit is within the dry gas window in terms of hydrocarbon generation ranges.
Źródło:
Geological Quarterly; 2011, 55, 2; 139-164
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A classic Late Frasnian (Devonian) chondrichthyan assemblage from southern Belgium
Autorzy:
Ginter, M.
Gouwy, S.
Goolaerts, S.
Powiązania:
https://bibliotekanauki.pl/articles/138985.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Late Devonian
Belgium
Dinant Synclinorium
chondrichthyes
microfossils
późny dewon
Belgia
ryby chrzęstnoszkieletowe
mikroskamieniałości
Opis:
Samples from the Upper Frasnian (Devonian) of Lompret Quarry and Nismes railway section in Dinant Synclinorium, southern Belgium, yielded several chondrichthyan teeth and scales. The teeth belong to three genera: Phoebodus, Cladodoides and Protacrodus. The comparison with selected Late Frasnian chondrichthyan assemblages from the seas between Laurussia and Gondwana revealed substantial local differences of taxonomic composition due to palaeoenvironmental conditions, such as depth, distance to submarine platforms, oxygenation of water, and possibly also temperature. The assemblage from Belgium, with its high frequency of phoebodonts, is the most similar to that from the Ryauzyak section, South Urals, Russia, and the Horse Spring section, Canning Basin, Australia.
Źródło:
Acta Geologica Polonica; 2017, 67, 3; 381-392
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sporadoceratid ammonoids from the Shotori Range (east-central Iran) - a case of putative gigantism caused by hydraulic sorting?
Autorzy:
Korn, Dieter
Ghaderi, Abbas
Devaere, Léa
Hairapetian, Vachik
Khanehbad, Mohammad
Belka, Zdzisław
Powiązania:
https://bibliotekanauki.pl/articles/949758.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Late Devonian
Famennian
Iran
ammonoids
body size
conodonts
dewon
famen
amonoidy
rozmiar
konodonty
Opis:
The Shotori Range of east-central Iran (east of Tabas) has yielded Famennian ammonoid assemblages dominated by the family Sporadoceratidae. Four genera Maeneceras Hyatt, 1884, Iranoceras Walliser, 1966, Sporadoceras Hyatt, 1884 and Erfoudites Korn, 1999 are represented. The conodont assemblage of one sample containing Iranoceras revealed an Upper marginifera Zone age. The ammonoid assemblages are characterised by comparatively large specimens; they reach conch diameters of 300 mm (including the body chamber) and the mean size is larger than 100 mm. The preservation of the material from the Shotori Range and size comparison with sporadoceratid assemblages from the Anti-Atlas of Morocco and the Rhenish Mountains of Germany suggest that hydraulic sorting has resulted in a bias towards large conchs, explaining the size distribution, rather than latitudinal differences. The new species Maeneceras tabasense is described; the genus Iranoceras is revised with a new description of the two species Iranoceras pachydiscus (Walliser, 1966) and Iranoceras pingue (Walliser, 1966).
Źródło:
Acta Geologica Polonica; 2019, 69, 1; 27-49
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heckerella, a new genus of the Early Frasnian [Late Devonian] atrypid brachiopod
Autorzy:
Rzonsnitskaya, M A
Sokiran, E V
Powiązania:
https://bibliotekanauki.pl/articles/22743.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Frasnian
Late Devonian
brachiopod
East European Platform
Atrypida
Heckerella
new genus
Brachiopoda
paleontology
Heckerella heckeri
Opis:
A new atrypid genus Heckerella from early Frasnian (Palmatolepis transitans Zone) of northwestern East European Platform is proposed. It includes only Heckerella heckeri, originally referred to Anatrypa. The new genus is characterised by weakly paraplicate anterior commissure, well-developed carina on the ventral valve, sulcus on the dorsal valve and coarser radial ornament. Heckerella has restricted geographic distribution in northwestern Russia, Latvia, northeastern Lithuania where it forms high-density associations with Pseudoatrypa velikaya.
Poważne zmiany ekosystemowe we wczesnym franie spowodowały spadek zróżnicowania taksonomicznego wśród atrypidów, ale przedstawiciele tej grupy pozostali do końca franu ważnym składnikem niektórych zespołów płytkowodnych ramienionogów. Opisany w niniejszej pracy nowy rodzaj Heckerella należy do ostatnich przedstawicieli rządu Atrypida. Jedyny znany gatunek tego rodzaju, H. heckeri (Nalivkin, 1941) pochodzi z wczesnego franu (poziom Palmatolepis transitans) późnocno-zachodnich rejonów Platformy Wschodnioeuropejskiej i pierwotnie został zaliczony do rodzaju Anatrypa Nalivkin, 1939. Od tego ostatniego rodzaju Heckerella gen. n. różni się słabo wyrażoną komisurą typu "paraplicate", dobrze rozwiniętą kariną na skorupce nóżkowej i grubymi żebrami. Nowy rodzaj, chociaż podobny do późnofrańskiej Gibberosatrypa Markovskii & Rzonsnitskaya, 1998, różni się od niej bardziej wyciągniętym (wydłużonym) brzegiem zawiasowym, obecnośocią wyraźniejszej ośrodkowej zatoki na skorupce grzbietowej i wąskimi, wysokimi żebrami.
Źródło:
Acta Palaeontologica Polonica; 2000, 45, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Late Devonian Upper Kellwasser Event and entomozoacean ostracods in the Holy Cross Mountains, Poland
Autorzy:
Olempska, E
Powiązania:
https://bibliotekanauki.pl/articles/20081.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
ostracod
Polska
entomozoacean ostracod
Ostracoda
Upper Kellwasser Event
paleoenvironment
Famennian
stratigraphy
Frasnian
Late Devonian
Devonian
Entomozoacea
extinction
Holy Cross Mountains
paleontology
Opis:
Late Frasnian–Early Famennian entomozoacean ostracod assemblages from the Płucki section in the Holy Cross Mountains were studied to establish the effect of the “Kellwasser bio−event” on the planktonic biodiversity and faunal content. The composition of ostracod assemblages changes from a moderately diverse (10 species) Entomoprimitia–Richterina– Nehdentomis–Nandania dominated “background” assemblage characterising a pre−event interval, to an Entomoprimitia−assemblage during the event interval, and finally to a Franklinella−dominated post−event assemblage in the Middle Palmatolepis triangularis conodont Zone. The Frasnian–Famennian extinction caused substantial losses among entomozoacean lineages. In the Płucki section it occurred in two closely spaced steps within the Palmatolepis linguiformis conodont Zone. The first step, at the base of the dark cephalopod limestone (Upper Kellwasser Horizon), reduced the abundance and the species diversity of entomozoaceans to only two Entomoprimitia species. The vacant niche was then filled by the new, immigrant species Entomoprimitia (Entomoprimitia) kayseri which is dominant in the Upper Kellwasser interval. All these species were lost at the second step within the Upper Kellwasser Horizon. The entomozoaceans remained virtually absent during a long time interval between the end−Frasnian crisis and the Middle Pa. triangularis Zone. They reappear as new species from refugia lineages (Franklinella, Nehdentomis) and became widespread, indicating favourable ecological conditions. Some 13 species have been identified and assigned to seven genera. Rabienella? lagowiensis sp. nov. is proposed.
Źródło:
Acta Palaeontologica Polonica; 2002, 47, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zróżnicowanie facjalne a skamieniałości późnodewońskich plakodermów w Górach Świętokrzyskich
Facies differentiation and Late Devonian placoderms fossils in the Holy Cross Mountains
Autorzy:
Szrek, P.
Powiązania:
https://bibliotekanauki.pl/articles/2074458.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Placodermi
ryby pancerne
sedymentacja osadów
skamieniałość fauny
dewon
Góry Świętokrzyskie
synsedimentation tectonic
Late Devonian
facies
Holy Cross Mountains
Opis:
Main Late Devonian placoderm taxa known from the Holy Cross Mountains are characterised. The distribution of the Late Devonian placoderm fossils is described. Variation in their occurrences depend on the sedimentation environment of the rocks which contain fossils of this group. Connections between the Holy Cross Mountains placoderms development and the synsedimentary tectonic processes active in this area during the Late Devonian is discussed, and the local faunas compared to classic assemblages of the same age from Latvia.
Źródło:
Przegląd Geologiczny; 2006, 54, 6; 521-524
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Do partly outdated palaeontological data produce just a noise? An assessment of the Middle Devonian-Mississippian biodiversity dynamics in central Asia on the basis of Soviet-time compilations
Autorzy:
Ruban, Dmitry A.
Powiązania:
https://bibliotekanauki.pl/articles/94488.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
palaeontological data
palaeobiodiversity
mass extinctions
Middle Devonian
Late Devonian
Mississippian
central Asia
dane paleontologiczne
masa wymarła
środkowy dewon
późny dewon
missisip
centralna Azja
Opis:
Interregional tracing of trends and events in the biotic evolution is an important task of modern palaeobiology. In Soviet times (1917-1991), numerous palaeontological data have collected for the territory of Russia and neighbouring U.S.S.R. countries. Later, these data were compiled and published in a series of reference volumes. Although this information cannot be updated in a conventional way, it remains valuable for quantitative analyses, particularly because of its comprehensive and unique character. Assessment of the previously collected data on the stratigraphic distribution of Middle Devonian-Mississippian marine invertebrates in three regions of central Asia (central Kazakhstan, Uzbekistan and Tajikistan) reveals some general patterns of biodiversity dynamics. The total number of genera generally declined during the Givetian-Famennian, whereas a remarkable diversity peak occurred in the Visean. This is consistent with the global pattern and, thus, permits to hypothesize a regional signature of the global trends. Changes in the extinction rate differ, however, between central Asia and the Earth in its entirety, which may be explained particularly by biases in either the regional or the global records. Evidence of the Givetian and Frasnian/Famennian mass extinctions is found in the three regions under study. Results of this tentative study indicate important directions for further research and suggest that central Asia is a highly important domain for studies of mid-Palaeozoic biodiversity dynamics.
Źródło:
Geologos; 2011, 17, 1; 29-47
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

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