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• <br />Table 2. Comparison of Geologic Characteristics of Sampling Sites <br />Mine name Elevation Coal Region Coal Field Coal Bed Features i Overburden Features <br />Marr Strip Sudduth Coal Bed Coalmont formation <br />No. 1 2530 North Park North Park Coalmont formation (Arkosic sandstone, <br />(2 sites) Paleocene epoch conglomerate and shale, <br />18 m thick sore coal) <br />60- thick <br />Empire 1450 Green River. Yampa Coal bed "F" <br />Energy Williams Fork <br />(2 sites) Formation, Upper <br />Mesaverde, Upper <br />Cretaceous Period <br />4-5mthick <br />Colowyo 2280 Uinta Danforth Coal bed "x", "y", <br />Hills "A", "B", "C°, "D", <br />"E", "F". Williams <br />Fork Formation <br />Mesaverde Group, Upper <br />Cretaceous Period <br />18 m thick <br />Hayden 2280 Green River Yampa Coal bed 1,2,3,4,5 <br />Gulch Williams Fork <br />Formation, Mesaverde <br />Group, Upper Cretaceous <br />Period <br />2 - 3 m thick <br />Seneca 2115 Green River Yampa Wadge Coal bed <br />Williams Fork <br />Formation, Upper <br />Mesaverde Group, Upper <br />Cretaceous Period <br />3 m thick <br />Lewis shale, Lance shale <br />and sandstone <br />Fort Union shale and <br />sandy shale, Wasatch <br />shale <br />15 - 30 m thick <br />Lewis shale, Lance shale <br />and sandstone <br />Fort Union shale and <br />sandy shale, Wasatch <br />shale <br />90 m maximum thickness <br />Lewis shale, Lance shale <br />and sandstone <br />Fort Union shale and <br />sandy shale, Wasatch <br />shale <br />36 m thick <br />Lewis shale, Lance shale <br />and sandstone <br />Fort Union shale and <br />sandy shale, Wasatch <br />shale <br />11 - 14 m thick <br />