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anticline as opposed to the westward dip of the hogback <br /> immediately to the north (Collins , 1977) . <br /> • <br /> The sedimentary units older than the Mancos shale maintain the <br /> form of the Grand Hogback and are steeply dipping between the <br /> FX�ibif �"- C-1 <br /> coal processing plant and Redstone, (See P+ace--4-) , (Full , 1972) . <br /> 0-1 <br /> is a geologic cross section illustrating the subsurface <br /> geology of the Coal Basin Anticline and the relation of the <br /> Dakota sandstone and older units to the coal bearing Mesaverde <br /> formation. A thrust fault cuts these older sedimentary rocks <br /> and thrusts them up over the Mancos shale. Drag from this <br /> thrust fault has overturned the units and dip is locally 850 <br /> to the east (Full, 1972).. This thrust fault is unrelated to <br /> the coal mining operation on the west side of the anticline, <br /> as is illustrated in . 2KIV,61I .ZY 0-1 <br /> Faulting occurs along the western rim of Coal Basin and is <br /> evident in the outcropping of the sandstone units (Full , 1972) . <br /> The depth of the faulting is not known, although it is believed <br /> to be related to the folding of the anticlinal structure. <br /> 12 <br />