Upper Devonian and Lower Carboniferous Foraminiferal Facies Associations from the Melekesskian Depression
Foraminiferal assemblages are studied in several stratigraphic levels of the Upper Devonian and lower Carboniferous deposits in borehole 1001 Trudoljubovskaya (East European Platform, Volgo–Ural region). The upper Frasnian complex corresponds to slope facies. In the middle Famennian deposits, represented by slope facies and back-reef apron facies, associations of two foraminifer zones, namely Septaglomospiranella primaeva and Eoendothyra communis, are tracked. The Tournaisian deposits, represented by carbonate slope fans, contain one association in the lower Tournaisian and two associations in the upper Tournaisian (the zones Chernyshinella glomiformis–Septabrunsiina krainica–Palaeospiroplectammina tchernyshinensis and Spinoendothyra costifera). In the upper Visean deposits, represented by formations of an open, shallow shelf, foraminifers of two zones are recognised, namely Archaediscus krestovnikovi–Endothyranopsis compressa and Archaediscus gigas. The quantitative and qualitative characteristics of the facies complexes are described.
KeywordsForaminifers Facies Upper Devonian Lower Carboniferous Melekesskian Depression
- Agafonova, G. V., & Zaytseva, E. L. (2005). New data on a structure of Carboniferous deposits of the Melekesskian depression and adjacent territories. Reports. VII International conference “New Ideas in Sciences about Earth”. T.1. S-I–S-IV. Moscow, 165 (in Russian).Google Scholar
- Fortunatova, N. K., Zaytseva, E. L., Shwetz-Teneta-Guriy, A. G., et al. (2007). New approaches to a stratigraphic subdivision of the Upper Devonian and Lower Carboniferous deposits of the western part of the Volga–Ural province. In Stratigraphy and its role in development of an oil and gas complex of Russia (pp. 303–334). St. Petersburg: VNIGRI (in Russian).Google Scholar
- Zaytseva, E. L. (2012). Late Devonian foraminifers of the eastern part of the Melekesskian depression. Modern micropaleontology. Materials of the XV All-Russian micropaleontologic meeting (on September 12–16, 2012, Gelendzhik) Moscow, pp. 64–66. (in Russian).Google Scholar