 The study examines a 50m thick succession of sediments from the classical paleogene section exposed along the Kuhl River, which is composed of soft marbles separated by a thick radial area-rich unit of noncalcareous and localcareous mudstones with intercalations of compact churty layers. The study uses nanofossil and denocyst biostratigraphy to identify the Paleocene-Eocene thermal maximum, PTM, and early Eocene-climatic optimum, ECO, as well as to provide detailed zonal subdivision and first-order calibration of nanofossil and denocyst bio-events during this time span. The study identifies the succession of Apectodinium hypercanthum, Axiodinium augustum, Deflandria ebisfeldensis, Dracodinium astra, Stenodinium mechelfeldens, Dracodinium varialangitutum, Aketodinium rominum slash Semlandia clamidophora and Areos feridium dictioplocum zones in the Appresian part of the CUS section. This article was authored by E. Sherbanina, A. Iacovliva, U. Gavrilov, and others. We are article.tv, links in the description below.