ABSTRACT

Recent structural studies have confirmed or established the following facts regarding the tectonics of the Beartooth-Bighorn region: (1) the Big Horn Basin is featured by peripheral folds (characteristically asymmetrical), apparently due to differential movement on basement faults; (2) the Pryor Mountains consist of four crustal blocks, each uplifted at the northeast corner, and bounded on the north and east by faults merging into monoclines; (3) there are local overthrusts on both the eastern and western sides of the Bighorns; (4) there is southward overthrusting south of the Wind River Canyon; (5) there are eastward, northward (and southward), and southwestward thrusts around the Beartooth Range.

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