SPECIFIC FACIES DIFFERENTIATION OF EARLY CRETACEOUS (BERRIASIAN–HAUTERIVIAN) FORAMINIFER COMMUNITIES IN THE UST’–YENISEI BASIN
S.N. Khafaeva
A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
Keywords: Berriasian, Valanginian, Hauterivian, communities, associations, foraminifers, West Siberia
Subsection: STRATIGRAPHY AND PALEONTOLOGY
Abstract
This paper is concerned with study and comparison of Berriasian, Valanginian, and lower Hauterivian foraminifer associations in northeastern West Siberia. Micropaleontological analysis of the Lower Cretaceous deposits of the Ust’-Yenisei region has given an insight into the taxonomic composition of microfossils in the studied sections. Analysis of the stratigraphic occurrence of foraminifers has revealed four successive biostratons in zones and beds. Communities of Berriasian, Valanginian, and earliest Hauterivian microbenthos are reconstructed, the regularities of their evolution are established, and the sequence of bionomic zones is revealed.
DOI: http://dx.doi.org/10.1016/j.rgg.2014.08.006
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