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than the coals of the Bowie Member and apparently represent a sedimentary <br />environment from transitional lower delta plain to upper delta plain <br />(fluvial). In the vicinity of the Hawk's Nest Mine these coals are, in <br />ascending order: <br />(1) D Seam - this attrital coal apparently thickens southward with a <br />range of about 6 feet to over 14 feet (excluding splits). This <br />coal directly overlies the Bowie Member and generally has very <br />good floor and roof sandstones. <br />(2) Wild Seam (Johnson's E Seam) - This coal is highly erratic with <br />generally discontinuous thin coals above and below a mineable <br />coal, with a characteristic thickness excluding splits of 5.5 to <br />10 feet. The coal invariably exhibits numerous splits and <br />generally has poor roof and floor sediments (usually carbonaceous <br />• shales and interbedded siltstones). <br />(3) E Seam (Johnson's Hawk's Nest or F Bed) - This is the seam which <br />has been and is mined at the Hawk's Nest Mine. It is an attrital <br />coal with a range in thickness of 4 feet 7 inches to over 12 feet, <br />generally thickening to the southwest where a top rider seam adds <br />approximately two and one-half feet to the total thickness. <br />Occasional coaly shale splits occur to the northwest. Floor sedi- <br />ments are generally carbonaceous shale, but roof sediments are <br />variable from carbonaceous shales with interbedded siltstones to a <br />good sandstone roof (generally to the northeast). <br />(4) F Seam (this coal was unnamed by Johnson) - It is generally <br />r. <br />u <br />erratic, based on a limited number of available core holes ranging <br />2.04-15 <br />