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Xenodiscacean Ammonoids and their bearing on the discrimination of the Permo-Triassic boundary

Published online by Cambridge University Press:  01 May 2009

E. T. Tozer
E. T. Tozer
Affiliation:
Geological Survey of Canada, Department of Energy, Mines and Resources, 601 Booth Street, Ottawa 4, Ontario.
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Summary

Xenodiscacean ammonoids from Dzhulfa in Soviet Transcaucasia, assigned to Tompophiceras, Bernhardites and Paratirolites, have been interpreted as indicating that the enclosing beds, which also contain tetracorals, productacean brachiopods and goniatites, are Lower Triassic. Critical examination of the identifications shows that these beds should be regarded as Permian, not Triassic. Tompophiceras and Bernhardites are based on Triassic type species but the specimens from Dzhulfa are not demonstrably congeneric. Interpretation of Tompophiceras as a genus with a fastigate venter is rejected. Paratirolites, previously regarded as Triassic, is evidently Permian, and is now recorded from Madagascar, this being the first record outside Transcaucasus. New evidence is presented concerning the exact age of Glyptophiceras. The Dzhulfa section has been interpreted as providing a continuous transition, in the marine facies, between beds of Permian and Triassic age. This interpretation is rejected. It remains probable that there are no sections, in any part of the world, that do so.

Type
Articles
Information
Geological Magazine , Volume 106 , Issue 4 , 27 August 1969 , pp. 348 - 361
Copyright
Copyright © Cambridge University Press 1969

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