Allahverdiyeva H.A., Murtuzayeva A.O.

Ministry of Science and Education of the Republic of Azerbaijan, Institute of Geology and Geophysics, Azerbaijan 119, H. Javid Ave., Baku, AZ1073: hallahverdiyeva63@gmail.com, arina.oktayevna@mail.ru

DOI: 10.35714/ggistrat20250200016

Summary. The paper is devoted to the biostratigraphic subdivision of the Paleogene deposits in Southeastern Gobustan. The subdivision was carried out on the basis of materials obtained from the Khilmilli section. Foraminiferal studies were conducted on samples collected from this section. The stratigraphic division of the Paleogene deposits in the studied area is thoroughly substantiated by foraminiferal data and traced throughout the Khilmilli section. Based on the rich foraminiferal assemblages within the section, the detailed stage- and zone-level subdivision of the Paleogene sequence was established. According to the microfaunal evidence, the Paleogene deposits are divided into the Paleocene, Eocene, and Oligocene series and their respective stages. It was determined that the rocks of the Danian and Thanetian (Paleocene), Ypresian, Lutetian, Bartonian, and Priabonian (Eocene), as well as the Rupelian (Oligocene) stages are represented in the Khilmilli section. Continuous tracing of the microfauna across the section allowed a precise interpretation of the complex composition of zones and changes within them. The distribution of foraminifera by zones was followed, and their development across the stages was described. At the same time, deposits of the Selandian stage were not detected in the section. Comprehensive data on the bionomy of the basin have also been provided.

Keywords: Foraminifera, fauna, Paleocene, Eocene, Oligocene, plankton, basin, Paleogene, microfauna

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