The study of Jurassic and Cretaceous deposits in the north of Western Siberia is of great interest for the search for oil and gas deposits. An urgent task is to refine the model of the structure of the boundary interval of Jurassic and Cretaceous deposits in the north-east of Western Siberia as a potential reservoir of hydrocarbons. The obtained new data (biostratigraphic and magnetostratigraphic) clarify the age of the lithological markers traced across the region. These data together with the results of detailed seismogeological correlation of sediments allowed us to propose a conceptual stratigraphic model of the Yanov Stan formation.