In general, the area consists of a northward-trending ridge, bounded on the west by a valley and on the east by a gently rolling basin. The dominant structural feature is the northward-trending ridge. The Darby thrust cuts the eastern flank of the ridge; the extreme northern end of the ridge is cut by a west-striking tear and two minor high-angle westward-dipping thrusts or reverse faults. In the eastern part of the area there is a secondary thrust which was detected by well data.

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