Сериальное издание: Soviet Geology and Geophysics (Geologiya i Geofizika)
Страницы: 10-16
Аннотация
A triassic boreal assemblages of Nautiloidea were separated as based on determinations of the Siberian collections and its partial publications, which permit one to subdivide the sections up to substages or in several cases (Upper Olenekian substage) regional zonal units that may be'characterized by these faunas. The principal features of geographic differentiation of this group in Triassic time were delineated.
