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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The middle Paleozoic section in the central Inyo Mountains is represented by slightly more than 2,000 ft of dark-colored hornfels with beds of limestone, impure chert, sandstone, and conglomerate near the base. Four formations have been differentiated: a previously unrecognized Middle Devonian unit, and the Perdido Formation, Chainman Shale, and Hamilton Canyon Formation of probable Late Mississippian age. The Middle Devonian rocks lie unconformably on beds ranging in age from Early Devonian to Middle Ordovician. A second unconformity separates the Middle Devonian section from the Perdido Formation. In the northern half of the Independence quadrangle, the upper part of the Chainman Shale, Hamilton Canyon Formation, and overlying carbonates of the Permo-Pennsylvanian Keele Canyon Formation are complexly folded, whereas the underlying rocks apparently lack this deformation. This suggests that the upper part of the sequence has been involved in a decollement.
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