Short description: Winfield (Stovall limestone) Limestone, with fault, exposed on both sides of Trooper Drive at 395 m (1296 ft); displacement probable result of collapse with dissolution of evaporates in underlying units; continuation of sequence that actually begins at GE-309; six digital photos: the second and third are of a 3-dm-thick Derbyia shell bed (the top is 9 dm below base of Stovall limestone); approximately 200 ft southeast of center of NE1/4, SW1/4, Sec. 13, T.11S., R.5E., Riley Co., Kansas.
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