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(3) Upper B Seam - Separted from the Lower B Seam by generally six <br />~. to ten feet of cooly shale, the Upper B Seam is consistently the <br />thickest coal of the Mesaverde sequence in this area. In the <br />vicinity of the Hawk's Nest Mine, it has a characteristic <br />thickness of 13 to 14 feet of attritial coal. In some instances it <br />carries thin splits of cooly shale. <br />(4) C Seam - This is the uppermost coal of the Bowie Member. It is <br />generally a clean attritial coal with a characteristic thickness of <br />six to seven feet. <br />The clastic sediments associated with these coals are generally fine- <br />grained and carbonaceous. They range from shales and siltstones to fine- <br />grained sandstones. Generally they are intimately interbedded, often <br />showing considerable boring activity, and in some cases, bioturbation. The <br />• massive sands are of marine origin, having significant amounts of glauco- <br />nite. A few shales are fossiliferous, carrying pelecypods identified as <br />Corbula. Thin light brown mudstone rarely interbeds with limestones up to <br />three inches in thickness. Environmentally, this sequence apparently <br />represents back barrier, lower delta plain and transitional lower delta <br />plain. As noted earlier, the mineable coal beds of this member exhibit a <br />consistent thickness. The top part of the Bowie Member is a barren clastic <br />sequence of shale, siltstone, and sand of approximately 175 feet in <br />thickness. <br />The Paonia, or Upper Coal Member of the Mesaverde contains three and <br />occasionally four mineable coals in a total sedimentary thickness of 400 to <br />600 feet. These coals are more variable in thickness and lateral extent <br /> <br />2.04-14 <br />