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poorly to moderately sorted , also with a clay matrix at the <br /> top . <br /> Directly above the Middle Sandstone is a <br /> coaly , black to gray , sandy siltstone which merges into the <br /> overlying coal seam, known as "M" Creek or Middle Bed Seam . <br /> The coal seam ranges from 5 ' to 20 ' thick, and is mined from <br /> the No . 2 mine entry . <br /> The overlieing sequence is the Upper Bowie <br /> Shale Submember . It consists of mudstones , sandstones and <br /> shales and is around 200' thick. <br /> The Upper Sandstone Submember , which overlies <br /> the Upper Bowie Shale , is up to 100 ' thick. It is similar <br /> to the Rollins and Middle Sandstone, except that grain size <br /> • is somewhat more coarse . <br /> Above the Upper Sandstone , is the Paonia <br /> Shale Member of the Williams Fork Formation. It consists of <br /> and includes the Placita and Sunshine Coal Intervals . <br /> The "Placita" seam is estimated at 3 ' to 6 . 8 ' <br /> thickness , and occurs at the base of the Paonia Shale Member . <br /> The seam is not mined because the coal is irregular and the <br /> bed is too thin. <br /> Some 50 ' to 60 ' above the "Placita" is the <br /> "Sunshine" seam. It is 18" to 4 ' thick, and is thought to <br /> be a fragment of the much thicker seam mined by another <br /> operator some 10 miles north of Coal Basin. As it occurs in <br /> Coal Basin, the "Sunshine" seam is uneconomic to mine . <br /> • The upper boundary of the Paonia Shale Member <br /> 10 <br />