Abstract
Foraminifera and ostracods similar to the Samotlor ones of the Middle and Upper Albian were found in the section of a newly drilled well in the Severnaya area of West Siberia. Host rocks are marine facies of the Khanty-Mansikian horizon, distributed in the northern paleobiogeographic district of the West Siberian Province. Foraminifera of the Middle Albian in this district are identified as the assemblage with Ammobaculites fragmentarius, Gaudryinopsis filiformis; the Upper Albian ones – the assemblage with Ammotium braunsteini, Verneuilinoides borealis assanoviensis. Layers with these assemblages are identified as foraminiferal zones of the Albian stage, belonging to the middle series of the Cretaceous System.
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