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Aegean and Bithynian: Proposal for Two New Anisian Substages

  • Riccardo Assereto
Conference paper
Part of the Schriftenreihe der Erdwissenschaftlichen Kommissionen book series (ERDWISSENSCHAFT, volume 2)

Abstract

Three ammonoid zones are recognized in unusually complete sections of early Middle Triassic marine pelagic rocks exposed on the Kokaeli Peninsula (Turkey) and on the Island of Chios. These zones are grouped into two substages named in ascending order Aegean and Bithynian. Superposition of the Aegean Substage on the Lower Triassic is well proven on the Island of Chios where beds with Aegean ammonites conformably overlie beds with a late Lower Triassic Subcolumbites fauna. The relationship between Bithynian and the overlying Pelsonian are well displayed by superposition of fossiliferous beds on the Kokaeli Peninsula. The new substages represent a stratigraphic interval that has been improperly known in the literature as “Hydaspian”, a chronostratigraphic unit much older, of Lower Triassic age. Their introduction therefore fills the need for named subdivisions and provides a standard for rocks of early Middle Triassic age throughout the world. On the basis of the new data it is proposed to enlarge the scope of the Anisian Stage to include the new substages and to divide it into two parts: an Upper Anisian based on the Illyrian and Pelsonian substages, and a Lower Anisian founded on the new Bithynian and Aegean substages. The lower boundary of each Anisian substage is defined in terms of beds at a type locality.

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Copyright information

© Springer-Verlag Wien 1974

Authors and Affiliations

  • Riccardo Assereto
    • 1
  1. 1.Istituto di GeologiaUniversità di MilanoMilanoItaly

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