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A Prairie Canyon member of the Mancos Shale forming low cuestas east of Green River, Utah. The top of the mesa is supported by the basal sandstones of the Blackhawk Formation. Photo courtesy of Steve Schamel.
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A Prairie Canyon member of the Mancos Shale forming low cuestas east of Green River, Utah. The top of the mesa is supported by the basal sandstones of the Blackhawk Formation.  Photo courtesy of Steve Schamel.