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Abstract <p>New data on the composition of nannoplankton and planktonic foraminiferal assemblages were obtained during a detailed study of boundary deposits of the Maikopian Group and the Siyaki Formation (Pteropod beds) in the Islamdag section (Shemakha-Gobustan region of Azerbaijan). Finds of stratigraphically important species in the assemblages of both microplankton groups including the zonal species <i>Sphenolithus heteromorphus</i>, allowed for a direct correlation with the NN5 Zone of the Martini scale. The definition of boundaries and range of the Tarkhanian regional stage in the Islamdag section is substantiated, and its correlation with the Tarkhanian stratotype and reference sections of the Eastern Paratethys is performed. The stages of evolution of microplankton assemblages are recognized and correlated with the Tarkhanian subdivisions, which provides an expanded micropaleontological characteristics of the top of the Maikopian Group and of the bottom of the Siyaki Formation.</p>

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New Biostratigraphic Records on the Boundary Interval of the Maikopian and Tarkhanian Sediments (Miocene) of Northern Azerbaijan

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • L. A. Golovina,
  • M. E. Bylinskaya,
  • A. A. Tkacheva,
  • S. V. Popov

摘要

Abstract

New data on the composition of nannoplankton and planktonic foraminiferal assemblages were obtained during a detailed study of boundary deposits of the Maikopian Group and the Siyaki Formation (Pteropod beds) in the Islamdag section (Shemakha-Gobustan region of Azerbaijan). Finds of stratigraphically important species in the assemblages of both microplankton groups including the zonal species Sphenolithus heteromorphus, allowed for a direct correlation with the NN5 Zone of the Martini scale. The definition of boundaries and range of the Tarkhanian regional stage in the Islamdag section is substantiated, and its correlation with the Tarkhanian stratotype and reference sections of the Eastern Paratethys is performed. The stages of evolution of microplankton assemblages are recognized and correlated with the Tarkhanian subdivisions, which provides an expanded micropaleontological characteristics of the top of the Maikopian Group and of the bottom of the Siyaki Formation.