Издатель: U.S. Department of the Interior Minerals Management Service Alaska Outer Continental Shelf Region , Место издания: Anchorage, Alaska , Год издания: 1994

Based on the study of numerous Lower and Middle Jurassic sections of the Russian Arctic, independent zonal scales for bivalves, foraminifera, and ostracodes were developed. In each zonal scale, parallel (for different facies) thick and thin zones can be distinguished on the basis of the distribution of the benthos in the ecological zones of the paleoseas. The age and stratigraphic volume of the proposed zones have been determined based on ammonites and correlated by marker levels through intermediate sections. For the Lower and Middle Jurassic of Asiatic Russia, 31 bivalve zones (b-zones), 24 foraminiferal zones (f-zones), and 9 ostracode zones (o-zones) were established. There are a number of biostratigraphic markers within the biozones which correlate well with sections in Western Europe, the Canadian Arctic, and northern Alaska. The boundaries of zones defined by different groups do not coincide, and therefore it is possible to recognize and to correlate the intervals representing the ceiling of the different zones (inside zonal correlation) in sections. The use of these scales for correlation of sections from middle Siberia, western Siberia, northeast Russia, and elsewhere yields excellent results.