Possible way of abnormal Bazhenov section imaging on regional stratigraphic scheme of West Siberian province

Regional schemes of West Siberian Jurassic and Cretaceous deposits approved by the Interagency Commission on Stratigraphy do not contain information on abnormal sections of the Bazhenov Formation. The latest revision of the Russian Stratigraphy Code allows describing abnormal sections of the Bazhenov Fm as a new type of auxiliary lithostratigraphic objects - olistostromes, which requires the development of missing graphical legend to display them on regional stratigraphic schemes. Basing on the analysis of common features of abnormal Bazhenov sections and theoretical mechanical earth model of their formation, the authors propose their own option of a legend to display spatial, stratigraphic, and genetic features on regional stratigraphic schemes of Western Siberia. The following parameters are to be displayed: stratigraphic position of initial and final depth of triggering seismite crack; lateral extent (area fraction) of intrusive sheet (sill body) in basal part of the Bazhenov deposits; final position of the Bazhenov olistolite in the Achimov series; degree of olistolite secondary split caused by its rising to the surface of sedimentary slope. The vector form of the legend neither overloads the limited area of regional stratigraphic schemes nor obscures the main information