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colluvial sediments, making it difficult to distinguish <br />• between the two geomorphic features. <br />3) Colluvium: colluvial deposits are considered to be all <br />loose, heterogeneous rock masses composed of soils and rock <br />fragments which have been deposited chiefly by mass-wasting, <br />usually at the base of steep slopes. Also, colluvium may be <br />deposited by unconcentrated surface runoff or sheet erosion, <br />again usually at the base of a steep slope. In the permit <br />area, colluvial deposits are found along the base on the main <br />hogback between the terrace material and exposed bedrock and <br />blanketing much of the bedrock along the south facing portion <br />of the hogback (Figure 5.1-1). <br />Coal Beds <br />Bowie Member <br />• Coal seams in the Bowie member are the most continuous of any of <br />the Mesaverde coals. Their cumulative thickness is 33 to 54 feet <br />and average 41 feet. At the top of this coal series is the D seam <br />which can be correlated from SK-13 westward to SK-7 where it <br />reaches its maximum thickness of 8 feet and to SK-6 where it is 4.5 <br />feet thick. Sixty to eighty feet below the D seam is the persis- <br />tent Wheeler seam which is 15.5 to 22.5 feet thick. This unit can <br />be correlated in drill holes throughout the permit area. <br />Exploration holes SK-12 and 13 penetrated a 7.5 foot thick coal 80 <br />feet below the Wheeler. To the west, this coal thins considerably <br />(SK-10), but appears to thicken again in the vicinity of SK-9A, <br />where it is 5 feet thick. The Lower Wheeler, identified on the <br />western end of the property, is 15.5 to 16.5 feet thick and is 30 <br />feet below the Wheeler. From subsurface information, the Lower <br />Wheeler is most likely a split from the main Wheeler seam. <br />r, <br />LJ <br />NCSC - Coal Ridge #1 3-15 ]18C/1145/900301 <br />