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JURASSIC FORAMINIFERA OF THE EASTERN SHORE OF ANABAR BAY (NORTH OF SIBERIA)
L. A. Glinskikh
А.A.Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia
The paper presents the results of micropaleontological analysis of the Middle-Upper Jurassic deposits of the eastern shore of the Anabar Bay (outcrop 109). The systematic composition of foraminiferal complexes has been clarified and expanded. Based on the analysis of the foraminifera distribution in the studied section, the following foraminifera zones are established: Trochammina jakovlevae JF22 (uppermost Upper Bajocian – lowermost Upper Bathonian); Kutsevella memorabilis, Guttulina tatarensis JF28 (uppermost Upper Bathonian – lowermost Lower Callovian); Trochammina rostovtsevi, Dorothia insperata JF-25 (uppermost Upper Bathonian – Callovian); Ammodiscus thomsi, Tolypammina svetlanae JF35 (Middle Oxfordian – lowermost Upper Oxfordian). Biostratons by foraminifera are compared with the refined subdivisions of the ammonite zonal scale. The brief description of the species Bulbobaculites taigaensis Levina, 1990, and Ammobaculoides primoris Komisarenko, 1977, known in the Jurassic of West Siberia, but first encountered in the Anabar region, is given. Images of characteristic and rare forms are given.
Keywords: foraminifera, Jurassic, Callovian, Oxfordian, north of Siberia.
DOI 10.20403/2078-0575-2024-1-24-31