Preliminary field investigations suggest three detachments in the Sadlerochit and Shublik Mountains: (1) the Kingak Shale, (2) along the pre-Mississippian unconformity, and (3) within the pre-Mississippian basement. The Kingak Shale décollement is the sole thrust for divergently branching subsidiary thrusts that repeat the Cretaceous Kemik Sandstone Member and overlying section. Well-exposed footwall and hanging-wall cutoffs together with multiple repetitions of Jurassic and Cretaceous over short distances demonstrate the detachment and provide permissive evidence of large-scale shortening. The detachment along the pre-Mississippian unconformity is not a sole thrust for subsidiary thrust faults. It is marked by cleavage development and folding of...

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