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Evolution of a Permo-Triassic sedimentary melange, Grindstone terrane, east-central Oregon

Geological Society of America Bulletin

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Abstract

Perceives the Grindstone rocks to be a sedimentary melange composed of Paleozoic limestone slide and slump blocks that became detached from a carbonate shelf fringing a volcanic knoll or edifice in Late Permian to Middle Triassic time and were intermixed with Permian and Triassic slope to basinal clastic and volcaniclastic rocks in a forearc basin setting. Paleogeographic affinities of the Grindstone limestone faunas and volcaniclastic debris in the limestone and clastic rocks all indicate deposition in promixity to an island-arc system near the North American craton. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Evolution of a Permo-Triassic sedimentary melange, Grindstone terrane, east-central Oregon
Series title:
Geological Society of America Bulletin
Volume
103
Issue:
10
Year Published:
1991
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1280
Last page:
1296
Number of Pages:
17