The Maastrichtian Section of Mount Kyz-Kermen (Crimean Mountains): Biostratigraphy, Sedimentation Conditions, and Paleogeography

摘要

This paper presents the results of a comprehensive study of the Maastrichtian sequence of Mount Kyz-Kermen located in the Southwestern Crimea. The section consists of a rhythmically bedded carbonate sequence gradually replaced by carbonate sandstones. The study of rocks in thin sections made it possible to identify eight lithotypes, and the chemical analyses yielded variations in individual elements in the rock composition. The interpreted data on planktonic and benthic foraminifera made it possible to determine the age of deposits within the accuracy of zones and beds with fauna and to find one more supposed break in the middle of this section, coinciding with a noticeable change in the rock composition. The assay analysis of foraminifera assemblages together with lithological and geochemical results made it possible to determine that the studied section was formed in open carbonate-platform conditions at the depth of the middle-outer shelf.