Structure of the Riddleville Basin from COCORP Seismic Data and Implications for Reactivation Tectonics

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Abstract
Seismic reflection data collected during COCORP's traverse of the southern Appalachians reveal that the Triassic Riddleville basin is a half-graben defined by strong, north-dipping basal reflections truncated on the north by a major south-dipping normal fault. Lithologies observed in similar basins suggest that these high amplitude, continuous reflections may be from lacustrine sediments or basaltic layers. The high-angle border fault soles into the Augusta fault, a major south-dipping, low-angle Paleozoic thrust. Geometric relations suggest that formation of the Riddleville basin reactivated this older Appalachian fault.

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