Tamara Nemyrovska - Academia.edu (original) (raw)

Papers by Tamara Nemyrovska

The stratotype of the Bashkirian Stage is located on the western slope of the Urals, Bashkiria, R... more The stratotype of the Bashkirian Stage is located on the western slope of the Urals, Bashkiria, Russia, and is represented by a carbonate sequence that shows the gradual deepening of a marine basin. The Lower Moscovian consists of limestones with interbedded cherts. The Bashkirian Stage in its type locality now begins at the base of the Homoceras Zone and not, as was previously the practice, the Reticuloceras Zone. The boundary between the Bashkirian and Moscovian stages in this area is still uncertain. The Bashkirian Stage is subdivided into seven conodont zones, and the Lower Moscovian into two. The conodont zonal boundaries do not correspond precisely to fusulinid zonal boundaries but are close to them at some levels. The interregional and intercontinental correlations of these deposits with other conodont sequences are made with varying degrees of confidence. The most precise correlations are made for the Lower Bashkirian.

The biotic turnover defining the mid-Carboniferous boundary was a consequence of a worldwide eust... more The biotic turnover defining the mid-Carboniferous boundary was a consequence of a worldwide eustatic event that lowered sea level, interrupted sedimentation, and greatly reduced taxonomic diversity in marine basins. The event, which affected ammonoids, foraminifers, corals, and crinoids, nearly eliminated Lower Carboniferous conodonts. Reorganization of conodonts around the mid-Carboniferous boundary occurred in four stages: (1) destabilization of assemblages and radiation of new species of the dominant genus Gnathodus at the beginning of the ecological crisis; (2) appearance of Upper Carboniferous genera, Declinognathodus and Idiognathoides, and initial attempts to adapt to new environments; (3) mass extinction of typical Lower Carboniferous gnathodids and paragnathodids; and (4) start of adaptive radiation of declinognathodids and idiognathoidids.

Tectonics and Stratigraphy, 2016

Collection of Scientific Works of the Institute of Geological Sciences of the NAS of Ukraine, 2013

Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen

Acta Geologica Polonica, 2006

The present study reports on conodonts from the El Hariga Formation (lower Visean) of the Saoura ... more The present study reports on conodonts from the El Hariga Formation (lower Visean) of the Saoura Valley, Algeria. This formation overlies the Hassi Sguilma Formation with the latest Tournaisian conodont assemblage with Scaliognathus anchoralis and it is overlain by the Mazzer Formation with the mid-Visean conodont fauna with Gnathodus bilineatus . The conodont assemblage of the El Hariga Formation contains the latest Tournaisian gnathodontids and the Visean Pseudognathodus and unornamented early Visean species of Lochriea . A new species, Lochriea saharae , a probable earliest representative of Lochriea is described. Its relationships to L. cracoviensis , L. commutata and Bispathodus stabilis are discussed.

The study of Ukrainian Paleozoic conodonts began in the 1960s in western Ukraine, when Danylo Dry... more The study of Ukrainian Paleozoic conodonts began in the 1960s in western Ukraine, when Danylo Drygant (State Museum of Natural History, L’viv) started to investigate the Silurian and Devonian conodonts of the Podolian and Volhynian sections. The Carboniferous conodonts of the Donets Basin, Dnieper-Donets Depression and L’viv-Volhyn Basin began to be studied in the early 1970s by four students of Prof. Dr. David Ye. Aisenverg: Oleg Ye. Kotlyar, Oleg M. Lipnyagov, Raisa I. Kozitska and Tamara I. Nemyrovska (Institute of Geological Sciences NASU). Carboniferous conodonts from the boreholes of the southwestern part of the Donets Basin were studied by Zoya A. Kossenko from “Artemgeology” in the town of Artemovsk, now Bakhmut. During their investigations a great number of new Carboniferous genera and species were described and the Carboniferous conodont zonation of the Donets Basin was constructed. In addition, Carboniferous conodonts from different areas of Europe and Asia were studied t...

2008 Joint Meeting of …, 2008

2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, America... more 2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Science Society of America, Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM. Paper No. 266-8, ...

Micropaleontology

The Global Stratotype Section and Point of the mid-Carboniferous boundary was selected in the Arr... more The Global Stratotype Section and Point of the mid-Carboniferous boundary was selected in the Arrow Canyon section within the lower Bird Spring Formation at the first evolutionary appearance of the conodont Declinognathodus noduliferus (Ellison and Graves) sensu lato. The studied boundary beds, spanning a 38.8-m interval from the Upper Mississippian into the Lower Pennsylvanian, occur in bryozoan-brachiopod-crinoidal grainstones/packstones with conodonts and foraminifers. The conodonts of the studied interval belong to the shallow-water Adetognathus-Rhachistognathus biofacies. The Adetognathus and Rhachistognathus species/subspecies A. lautus (=A. gigantus), A. spathus, R. minutus minutus, R. muricatus, R. primus, R. prolixus, R. websteri and transitional forms dominate the succession. Gnathodus girtyi simplex, G. lanei n. sp., G. defectus and transitional forms between them are abundant. The elements of the boundary-marker D. noduliferus s. l. and transitional forms between G. girt...

Palaeogeography, Palaeoclimatology, Palaeoecology, 2006

The boundaries of the Devonian, Carboniferous, and Permian stages of the Global Stratigraphic Ref... more The boundaries of the Devonian, Carboniferous, and Permian stages of the Global Stratigraphic Reference Scale (abbreviated to Global Stratigraphic Scale—GSS) are described in relation to the biostratigraphic and/or lithostratigraphic units of the Regional Stratigraphic ...

Stratigraphy, 2017

The updated conodont zonation for the Serpukhovian, Bashkirian, and Moscovian stages of Ukraine p... more The updated conodont zonation for the Serpukhovian, Bashkirian, and Moscovian stages of Ukraine presented here is the result of long-term studies of the Carboniferous conodonts in the Donets Basin, Dnieper-Donets Depression, and L'viv-Volhyn Basin. The detailed investigations were mostly conducted in the nearly complete, well-exposed Carboniferous succession in the Donets Basin, which has been regarded as a standard for the Carboniferous System. Three conodont zones are distinguished in the Serpukhovian Stage. The earliest Serpukhovian zone, the Lochriea ziegleri Zone, is defined in the Dnieper-Donets Depression and in the L'viv-Volhyn Basin and is correlated with the Cavusgnathus naviculus Zone of the shallow-water to coal-bearing units of the Donets Basin. Species of the Gnathodus bilineatus group, which dominate late Mississippian conodont faunas in Ukraine, are used to subdivide the upper Serpukhovian and correlate it to other areas. The dominant species of Idiognathoides and Declinognathodus provide the conodont zonation for the Bashkirian and the earliest Moscovian. The lower Bashkirian boundary, which is the boundary between the Mississippian and Pennsylvanian subsystems, is defined in the Donets Basin and Dnieper-Donets Depression by the FAD (first appearance datum) of Declinognathodus noduliferus. Six Bashkirian and one Moscovian zones comprise, in ascending order, the Declinognathodus noduliferus, Idiognathoides sinuatus-Id. sulcatus sulcatus, Idiognathodus sinuosus-Id. sulcatus parvus, 'Streptognathodus'expansus, Id. tuberculatus-Id. fossatus, Decl. marginodosus, and Decl. donetzianus zones. The proposed base of the Moscovian Stage is the FAD of Decl. donetzianus in the Donets Basin. Above this level, species of Neognathodus, 'Streptognathodus' and Idiognathodus comprise two currently recognized zones, the N. atokaensis-'Streptognathodus' transitivus and I. izvaricus zones. Species of Swadelina provide the basis for zonation of the late Moscovian in the Donets Basin: in ascending order, the Swadelina dissecta, Sw. gurkovaensis, and Sw. subexcelsa zones. The most significant levels for correlation to other Carboniferous basins are the lower boundaries of the Lochriea ziegleri Zone (= Visean/Serpukhovian boundary), Decl. noduliferus s.l. Zone (= Serpukhovian/Bashkirian boundary), Decl. donetzianus Zone (= Bashkirian/Moscovian boundary) and Idiognathodus sagittalis-I. sp. A Zone (= Moscovian/Kasimovian boundary).

Palaeogeography, Palaeoclimatology, Palaeoecology, 2012

Geodiversitas, 1998

Résumé/Abstract The compilation of detailed stratigraphic, sedimentologic and paleontologic data ... more Résumé/Abstract The compilation of detailed stratigraphic, sedimentologic and paleontologic data resulted in stratigraphic correlations of marine and continental areas outcropping today in the Tethyan and Peri-Tethyan domains:(1) the base of the Moscovian ...

The present study reports upon the conodont fauna of the Upper Serpukhovian through Lower Moscovi... more The present study reports upon the conodont fauna of the Upper Serpukhovian through Lower Moscovian of the Donets Basin, Ukraine. Three new species are described: Declinognathodus? pseudolateralis, Idiognathodus praedelicatus and Idiognathoides postsulcatus. The relatively continuous, rhythmic succession of shales, siltstones and sandstones, with limestone interlayers and coal seams contains a wide variety of fossils: foraminifers, conodonts, brachiopods, ostracods, corals, gastropods, ammonoids, crinoids, bivalves, bryozoans, plant remains etc. It is therefore the key or standard sec-tion for interregional and intercontinental correlations. Additionally, the Bashkirian Stage is signifi-cant in Late Carboniferous conodont evolution as during this interval all of the Late Carboniferous and Early Permian genera originated. At the Mid-Carboniferous boundary almost all of the Early Carboniferous conodont genera became extinct. The descendants of the Early Carboniferous genus Gnathodus a...