Callovian Ostracods of Central Dagestan: Biostratigraphy, Paleoecology, and Chorology
| Autor: | E. M. Tesakova, L. A. Glinskikh |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010506 paleontology
biology Stratigraphy Chorology Paleontology Geology Biostratigraphy 010502 geochemistry & geophysics biology.organism_classification 01 natural sciences Ostracod Paleoecology Sequence stratigraphy Sedimentology Structural geology 0105 earth and related environmental sciences Cruciata |
| Zdroj: | Stratigraphy and Geological Correlation. 28:402-415 |
| ISSN: | 1555-6263 0869-5938 |
| Popis: | Analysis of the distribution of ostracods from the Armkhi Formation (Callovian) of the Tsudakhar section (Central Dagestan) enabled the identification of a stratigraphic sequence of six assemblages determined by paleoecological conditions and the first ostracod-based biostratigraphic zonation of the Callovian of Dagestan. Beds with Pleurocythere khapissovi and the Neurocythere cruciata intermedia Zone of the European ostracod scales were identified in the middle Callovian; this facilitated the interregional correlation for ostracods. Paleoecological analysis demonstrated the formation of the lower part of the section (beds with P. khapissovi and the N. cruciata intermedia Zone) in the coastal zone of the upper subtidal with normal marine 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) accumulated in 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 studied revealed the connections of the Caucasus Sea to Western and Eastern Europe and to Central Asia. |
| Databáze: | OpenAIRE |
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