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Roadside Mine, C-1981-041 <br />Geology of the South Mine Stratigraphic Column <br />- Soil, Subsoil and substratum: <br />The unit consists of the Barx-Clapper soil. The Barx-Clapper soil is found on 3 to 12 <br />percent slopes. The unit is composed of 60 percent Barx loam and 25 percent Clapper very stony <br />loam. Both components of the soil are: deep and well -drained, the runoff potential is listed as <br />medium, and the hazard of water erosion is high. The thickness of this unit is variable. <br />- Undifferentiated Mesaverde: <br />The unit is composed of several interbedded layers of siltstones, sandy siltstones and <br />sandstones. The thickness of this unit can vary depending on the location in the South Mine <br />area. <br />- Carbonera Coal Seam: <br />The Carbonera Coal seam ranges from 6 to 8 feet in thickness where present in the Permit <br />Area. This coal seam was not mined due to its inconsistent thickness and quality. <br />- Zone of Interbedded shales and sandstones: <br />This portion of the Mesaverde Group consists of interbedded shales and sandstones. The <br />unit is about 64 feet thick in the South Mine area. <br />- Cameo C Coal Seam: <br />The Cameo C Seam, also known as the Rider seam, is approximately 3 to 4 feet thick <br />where present in the South Mine area. This seam was mined in some areas of the permit where it <br />was economical. <br />- Shales: <br />The separation between the Cameo B and C seams varies from 4 to 25 feet in the south <br />permit area. This layer is composed of shales. <br />- Cameo B Seam: <br />The B seam is the main mined coal seam of the Roadside Mine. The coal seam varied in <br />thickness from 4 to 8 %2 feet in the south permit area. The average thickness is about 6 feet. The <br />coal from the B seam is classified as high volatile bituminous. The coal is low in sulfur and has <br />a moderately high ash content. The B seam directly overlies the Rollins Sandstone. <br />- Rollins Sandstone: <br />The Rollins Sandstone Member of the Mount Garfield Formation is approximately 114 <br />feet thick in the South Mine area. The Rollins Sandstone is a marine deposited sandstone <br />representing the transition of shoreface deposits to marginal marine deposits. <br />*Note: <br />-The B seam is in the Bookcliffs coal field which is a part of the Mount Garfield Formation of <br />the Mesaverde Group. <br />-The amount of overburden above the B seam is approximately 100 feet. <br />