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PERMFILE119279
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PERMFILE119279
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Last modified
8/24/2016 10:15:01 PM
Creation date
11/25/2007 6:48:15 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1984065
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
3.3 Hydrology and Geology
Media Type
D
Archive
No
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• <br />The exposed rock sequence in the permit area is Jurassic through <br />Tertiary in age and includes the Morrison Formation, Dakota <br />Sandstone, Mancos Shale, the coal-bearing Mesaverde Group, and the <br />Wasatch and Ohio Creek formations. Figure 3.3-3 shows the general <br />stratigraphic relationships of the immediate mine area above the <br />Mancos Shale. <br />3.3,2.1.1 Stratigraphy <br />Morrison Formation <br />The Morrison consists of brightly colored variegated shales, <br />siltstones, and sandstones. It is easily eroded to from steep <br />slopes below the Dakota Sandstone. <br />Dakota Sandstone <br />The Dakota Sandstone consists of 100 to 150 feet of hard gray to <br />• buff sandstone, locally quartzitic and forms strike ridges along <br />the Grand Hogback. One such strike ridge occurs just east of the <br />Riverbend Subdivision (Figure 3.3-2). <br />Mancos Shale <br />The Mancos Shale forms strike valleys along the Grand Hogback, <br />including the proposed facility area. It consists of two marine <br />shale members separated by a limestone member and is at least 4000 <br />feet thick in the mine area. <br />Mesaverde Group <br />The Mesaverde Group conformably overlies the Mancos Shale and <br />ranges in thickness from 4760 feet near South Canyon to 4895 feet <br />near New Castle (Collins, 1976). The Group consists of interbedded <br />and lenticular sandstone, shale, siltstone, and coal beds. In <br />ascending order, it contains (1) the Corcoran sandstone, a marine <br />NCgC - Coal Ridge ~1 3-11 A8C/1145/900301 <br />
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