As the title implies the article presents the results of many years comprehensive research of the Western Siberian Upper Cretaceous stratigraphy (without Cenomanian). The volume of Upper Cretaceous formation, their biostratigraphic and lithological characteristics are discussed. Based on the analysis of new materials (lithological, biostratigraphic, well geophysics investigation data, magnetostratigraphic, seismostratigraphic), the regional correlation scheme of formations, members and beds has been refined. A new model of correlation schemes, a scheme of facies zoning, and reasonable changes in the nomenclature of the Upper Cretaceous formations are proposed. The Slavgorod and Ipatovo horizons have been replaced by a single Berezovo horizon. Specific properties description of the new suites, established at the first (Okhteurievo, Tagul, Bolshaya Laida, Nizhnaya Agapa), have been done.
Layering of the Lower-Berezovskaya subformation in Western Siberia was made on the basis of alterna-tive stratigraphic layering conception of Upper Cretaceous sediments, geological and lithological structure models of the sediments based on sections data from well logging were made.
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