One exposed and another inferred thrust fault in the southeastern Inyo Mountains of east-central California are interpreted as Early Permian in age. These faults, both apparently of local extent, are temporally and geographically related to a major episode of basin formation which occurred along a southeast-trending segment of the Permian North American plate margin. The close relationship between basin formation and thrust faulting supports a previous interpretation by us that this segment of the margin was undergoing active wrench tectonism during the Early Permian, resulting in the essentially simultaneous development of local extensional and compressional structures similar to those now forming in the California continental borderland.

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