Laserfiche WebLink
• portion of the Old King Seam and the upper split to that of the Somerset <br />Seam of the North Fork/Minnesota Creek Area. <br />The upper seam in the Lower Coal Member of the Coal Creek Area conforms <br />to the position of the C Coal Seam in that it lies immediately below a <br />massive sandstone. It is, therefore, termed the C Coal Seam in this <br />area, although the interval above the top of the Rollins Sandstone <br />Member is appreciably less than that in the North Fork/Minnesota Creek <br />Area. It is a persistent seam which is locally mineable, but is less <br />than 3 feet thick in most of the Coal Creek Area. The presence of <br />unusually large amounts of sandstone in a Lower Coal Member zone <br />suggests the possibility that a northeastwardly flowing stream separated <br />the 2 areas of coal deposition and deposited a sand barrier between <br />them. <br />Upper Coal Member. The Upper Coal Member of the Mesaverde Formation <br />comprises a sequence of interbedded sandstone and shale similar to that <br />• in the Lower Coal Member except that the seams are extremely lenticular. <br />This Member ranges from 400 to 600 feet in thickness and is capped by <br />thick sandstone. The lenticular nature of this upper sandstone makes it <br />difficult to identify the upper limit of this Member in some places. <br />The Upper Coal Member contains as many as 4 workable seams, but the <br />thick coal beds are more restricted in the area than those in the Lower <br />Coal Member. Previous work on Minnesota Creek disclosed 3, and locally <br />4, commercial seams, some of which are unusually thick. Exposures and <br />drill holes on the North Fork show 2, and locally 3, mineable seams. In <br />the Coal Creek Area, however, coal seams in this member are thin, and <br />the best showing of coal encountered was where the coal is 26 and 23 <br />inches thick. North of Township 13 South and Range 89 West, the coal <br />seams are represented by bone and thin erratic seams of coal commonly <br />less than 1 foot thick. In the Minnesota Creek Area, the Upper Coal <br />Member contains 3 main coal seams. The lowest of these is designated <br />the D Coal Seam. It ranges in thickness from 3 feet to over 10 feet. <br />• It rests on the massive sandstone that marks the top of the Lower Coal <br />2.04-15 <br />