Abstract
This paper presents the results of the integrated study of dinocysts and diatoms from the Kamyshin Formation, Dyupa Gully section. The Kamyshin Formation is shown to have been formed in the Late Thanetian-initial Eocene and to include the IETM interval. The Dyupa Gully section is comprised of the deposits of two transgressive-regressive cycles. The section is comprehensively characterized by micropaleontological finds (dinocysts, radiolarians, and diatoms) and proposed as a key section of the Middle Volga Region.