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II I III I II I II IIII III Doc Date:12/11/2007 <br />999 <br />S~ 2.04.6 GEOLOGY DESCRIPTION <br />Geology - Background <br />The Meadows No. 1 permit area is situated in the southeastern part of the <br />Green River coal region which extends across southwestern Wyoming and north- <br />western Colorado. The local mining activity lies within the Yampa Coal Field <br />which is centered around Hayden, Colorado. This field represents the southern <br />limit of the Green River Region. The mine property is located on the western <br />flank of the northeastward trending Taw Creek Anticline. Strata of Upper <br />Cretaceous age strike northward and dip to the west 14 to 23 percent. The for- <br />mations in ascending order are the Mancos shale, the Mesaverde group (Iles and <br />Williams Fork formations), and the Lewis shale. The important coal seams are <br />located in the formations of the Mesaverde group. <br />Recent drill hole and field data support previously published evidence of <br />• minor displacement faulting north and southwest of the Meadows No. I permit <br /> area. There is no major faulting on the mine property, although minor faults <br />have been identified and are located on Maps 4 and 4A. <br />An illustration of the stratigraphy within the immediate area of the mine <br />is presented on Figure 2.04.6-1. <br />The Mancos shale conformably overlies the Dakota sandstone. It is <br />approximately 4,900 feet thick and consists chiefly of homogeneous dark-grey <br />marine shale. Several beds of silty to limey sandstone, as well as several <br />light-grey limestones, have been identified in the Mancos shale. <br /> <br />- 64 - (Rev. 5/86) <br />