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The Coal Basin anticline is restricted in outcrop to the <br /> Mancos shale and younger units . To the east of the anticline <br /> the units older than the Cretaceous Mancos shale outcrop at the <br /> southern end of the Grand Hogback and are steeply dipping to <br /> the west . A thrust fault , unrelated to the Coal Basin mining <br /> area, brings these older units up over the younger Mancos shale <br /> immediately south of Coal Creek (Full , 1972; Tweto, 1978) . <br /> 5 <br />