CALLOVIAN OSTRACODS OF THE CENTRAL DAGESTAN: BIOSTRATIGRAPHY, PALEOECOLOGY AND CHOROLOGY

Tesakova, E.M.; Glinskikh, L.A.

Авторы: Tesakova E.M., Glinskikh L.A.
Журнал: Stratigraphy and Geological Correlation
Том: 28
Номер: 4
Год издания: 2020
Издательство: Pleiades Publishing, Inc.
Местоположение издательства: New York, USA
Первая страница: 402
Последняя страница: 415
DOI: 10.1134/S0869593820040097
Аннотация: Analysis of the distribution of ostracods from the Armkhi Formation (Callovian) of the Tsudakharsection (Central Dagestan) enabled the identification of a stratigraphic sequence of six assemblages determinedby paleoecological conditions and the first ostracod-based biostratigraphic zonation of the Callovianof Dagestan. Beds with Pleurocythere khapissovi and the Neurocythere cruciata intermedia Zone of the Europeanostracod scales were identified in the middle Callovian; this facilitated the interregional correlation forostracods. Paleoecological analysis demonstrated the formation of the lower part of the section (beds withP. khapissovi and the N. cruciata intermedia Zone) in the coastal zone of the upper subtidal with normalmarine salinity, good aeration, and low sedimentation rates. Sediments of the upper part of the section(paleoecological intervals with Schuleridea translucida–Cytherella perennis and with C. perennis) accumulatedin the lower zone of the upper subtidal with a high sedimentation rate, high (and constantly increasing)eutrophication, and lowered pH values. Analysis of the paleogeographic distribution of the species studiedrevealed the connections of the Caucasus Sea to Western and Eastern Europe and to Central Asia.
Добавил в систему: Тесакова Екатерина Михайловна

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CALLOVIAN OSTRACODS OF THE CENTRAL DAGESTAN: BIOSTRATIGRAPHY, PALEOECOLOGY AND CHOROLOGYстатья

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