Pdf: http://www.ipgg.nsc.ru/Journal...._06.pdf

Based on material from recently drilled boreholes, ammonite genera and species are described being important for the
Callovian subdivision. A data bank of new and previously identified Callovian ammonites is compiled, with indication of their exact location and publication. New paleontological data facilitate the substantiation of current Callovian biostratons (substages and zones) of Western Siberia and a more precise definition of their stratigraphic extent in certain regions. The established dominance of the Arctic genera and species of the Cardioceratidae suggests an Arctic biogeographic realm for the Western Siberian sedimentary basin in the Callovian. The presence of genera and species that migrated from the west in all the three Callovian subages serves in authors’ opinion as a criterion for referring the Western Siberian Basin to the Greenland province located along the western boundary of the Arctic realm, such taxa being absent outside of that realm. But such proposal seems to be not correct because between Greenland and Pechora Basin (in such places as Barents sea shelf, Spitsbergen) Subboreal Callovian ammonites are unknown. Thus Greenland and West Siberia should belongs to two separate provinces. Some important ammonite taxa are described and figured. Among these ammonites are most eastern records of Quenstedtoceras s.s. (Quenstedtoceras (Q.) cf. lamberti) and Elatmites.