SPECIFIC GEOGRAPHIC DIFFERENTIATION OF BOREAL CEPHALOPODS OF CARNIAN AGE
A.G. Konstantinov and E.S. Sobolev
Institute of Petroleum Geology, Siberian Branch of RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Paleobiogeography, ammonoids, nautiloids, Late Triassic, Carnian Age, Boreal Realm
Pages: 905-912
Abstract
Comparative analysis of complexes of Boreal nautiloids and ammonoids has been made for the first time for some phases of the Carnian Age, and the rules that control their geographic differentiation have been unraveled. The distinctions between Carnian cephalopods of the western (Svalbard, Arctic Canada) and eastern (northeastern Asia) Boreal Realm allowed us to distinguish the Canadian and Siberian Provinces. Ammonoid-based provinces are possible for the late Early Carnian and Late Carnian, when ammonoid fauna in the Boreal Realm was distinguished by genera and families. The best-pronounced distinctions between these provinces by nautiloids (presence of specific genera) have been found in the Early Carnian (tenuis phase).
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