Laserfiche WebLink
§2.04 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES -- <br />MINIMCJM REQUIREMENTS FOR INFORMATION ON ENVIRONMENTAL RESOURCES. <br />• 2.09.6 Geology Description. <br />(2) ( a) (COnt'd .) <br />The Eocene Wasatch Formation consists of variegated mudstone <br />and siltstone with interbedded medium gray lenticular <br />sandstone, which is locally conglomeratic (Junge, 1976). <br />Maximum thickness is reported to be approximately 1600 ft. <br />(Hail, 1972), although exposures are largely obscured by <br />surficial deposits. The Wasatch Formation represents <br />terrestrial sedimentation, dominated by fluvial processes, <br />which preceded the Lacustrine Green River Formation. <br />Structural Geologv: The Piceance Creek Basin is a typical <br />intermontaine basin of the Rocky Mountain region in which coal <br />bearing strata are present. Bounded on the north by the <br />Uintah Uplift, and west by the Douglas Creek Arch, the basin <br />is asymmetric with the synclinal axis trending with the Grand <br />Hogback. The main synclinal axis bifurcates southwest of <br />Meeker, Colorado, and trends northwest. The Douglas Creek <br />Arch, south of Rangely, Colorado, is characterized by <br />extensive faulting and numerous subsidiary structural <br />flexures present throughout the basin (Johnson, 1962). <br />Abundant tertiary intrusive bodies, located in the <br />southeastern portion, give the basin a northwesterly plunge. <br />In the southwestern portion, 3 to 5 degree dips prevail while <br />• along the Grand Hogback, vertical to overturned beds are not <br />uncommon. Although the Piceance Creek Basin was formed during <br />the Larimide Orogeny, recent seismic activity detected near <br />Carbondale, Colorado, may suggest the diastrophism is <br />continuing or being reactivated. Maximum structural relief, <br />measured from the top of the pre-Cambrian, is estimated by <br />Murray (1962) to be at least 27,000 ft. <br />Elevation of the Permit Area ranges from 9195 feet plus in the <br />northwestern portion of Lease C-37210 to 5800 ft. near highway <br />133. Exposed lithologies range in age from Upper Cretaceous <br />Mancos and Mesaverde to Holocene alluvial fill along the North <br />Fork of the Gunnison River. <br />i• <br />/a12-IO8 <br />Revised 08/01/84 <br />Revised 10/01/87 <br />Revised 9/21/01 <br />/3PPRov60 17 <br />~/~9/~4 <br />