It is proposed to separate a regionally persistent member of fine-dispersed mudstones as the individual Kogalym Member within the Lower Vasyugan Subhorizon (Uppermost Bathonian–Lowermost Oxfordian). We present data on the lithologic composition, geophysical characteristics, and geochemical properties of the organic matter and depositional environments of the member. The Tyumenskaya SG-6 well is proposed as a type section of the Kogalym Member, where a biostratigraphic approach has yielded the Middle–Upper Callovian volume of the member. We also discuss the aspects of specification and detalization of the Callovain–Oxfordian part of the Callovian and Upper Jurassic regional scheme of West Siberia.

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