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The AAPG/Datapages Combined Publications Database

CSPG Special Publications


Permian Triassic Systems and Their Mutual Boundary — Memoir 2, 1973
Pages 647-654

The Main Relationships Between the Changes in Marine Fauna at the Close of the Permian and the Beginning of the Triassic

A. S. Dagis, V. I. Ustritsky


The evolution of the main faunal groups at the end of the Permian and the beginning of the Triassic differed within the Boreal and Tropical areas. The Paleozoic fauna of the Boreal area was extinct by the end of the Permian and the subsequent appearance there of Mesozoic elements in the Triassic was due to migration from the Tropical area. Changes in the various faunal groups took place at different times and therefore preclude the view that the Paleozoic-Mesozoic boundary was associated with all-embracing instantaneous changes.

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