Callovian Ostracods of Central Dagestan: Biostratigraphy, Paleoecology, and Chorology

E. M. Tesakova, L. A. Glinskikh

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)402-415
Number of pages14
JournalStratigraphy and Geological Correlation
Volume28
Issue number4
DOIs
Publication statusPublished - 1 Jul 2020
Externally publishedYes

Keywords

  • biostratigraphy
  • Callovian
  • Central Dagestan
  • chorology
  • Middle Jurassic
  • ostracods
  • paleoecology

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