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<br />Williams Fork Formation <br />Bowie Member <br />The Bowie member is about 1000 feet thick near South Canyon and 960 <br />feet thick near New Castle and consists of four general units. <br />They are in ascending order: (1) a coal-bearing shale unit 950 <br />feet thick (containing the Lower Wheeler, Wheeler, and the D <br />seams), (2) a sandstone unit (Middle sandstone) 50 to 150 feet <br />thick, similar texturally and mineralogically to the Rollins <br />sandstone, (3) a 200-ft thick shale unit which contains thin coal <br />seams, including the Allen and possibly the Anderson, near South <br />Canyon, and (4) an Upper sandstone unit 50 to 150 feet thick also <br />similar to the Rollins sandstone. <br />Paonia Member <br />The Paonia member is not well defined in this area but generally <br />• consists of about 600 feet of interbedded sandstone, shale, and <br />numerous thin coal beds. It is similar to the Bowie member, but <br />contains more sandstone and is more lenticular. The top of this <br />unit is gradational and is usually placed where sandstone becomes <br />dominant over siltstone and shale (Collins, 1976). The coal beds <br />are irregularly distributed, both aerially and stratigraphically, <br />making correlation difficult. The named coal beds of the Paonia <br />member in the permit area are the C, B, and A. In addition to <br />these, there are several thin beds of doubtful correlation. They <br />may represent tongues of the more prominent beds or individual <br />lenses of limited aerial extent. <br />Undifferentiated Mesaverde Formation <br />The Upper or Undifferentiated Mesaverde (non-coal-bearing) member <br />is 2000 to 4000 feet thick, and consists of a series of channel <br />sandstones, some coarse-grained to conglomeratic siltstones, <br />. shales, and very lenticular, mostly thin coal beds (Collins, 1976), <br />NCSC - Coal Ridge #1 3-13 ABC/1145/900301 <br />