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The AAPG/Datapages Combined Publications Database

CSPG Special Publications


Permian Triassic Systems and Their Mutual Boundary — Memoir 2, 1973
Pages 176-199

The Permian-Triassic Boundary in the Southern Alps (Italy)

R. Assereto, N. Fantini Sestini, A. Bosellini, W. C. Sweet


In the Southern Alps of Italy, as in many other places in the world, an unconformity separates Upper Permian and Lower Triassic rocks. Brachiopods in the uppermost part of the Permian Bellerophon Limestone indicate correlation with the Comelicania (or Phisonites) beds of southern Armenia and Iran, and the distribution of conodonts, bivalves, and gastropods suggest that the base of the Werfen Formation (Triassic) closely approximates the base of the Triassic System. Stratigraphic, sedimentologic, and paleontologic data indicate that in the Late Permian, the area of the Southern Alps included a continental region that graded eastward into a highly saline epicontinental sea in which the Bellerophon Limestone accumulated. Following a short regression in the latest Permian, and probably accompanied by change to a somewhat more humid climate, the paleogeography developed in Late Permian time was “drowned” by rapid transgression of a shallow epeiric sea in which the Werfen (or Servino) Formation was deposited.

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