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Two areas in the Big Horn Mountains are given as examples of the beauty and simplicity of the drape-folding-over-basement-block model of structural interpretation. The Piney Creek thrust is interpreted as an uplifted fault block with sedimentary strata draped over its edges. Structural cross sections of the Horn area show how sedimentary layers are continuously folded over a faulted basement.

In both areas, the role of a ductile stratigraphic unit, the Gros Ventre shale of Cambrian age, is important in partially decoupling the basement from the overlying sedimentary veneer and in providing a slide surface for gravity phenomena. Gravity glide masses...

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