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C . General Description of Geology and Hydrology <br /> 1 . Introductiil <br /> The Mid-Continent coal mining operation extracts <br /> II <br /> coal from the Cretaceous strata in Coal Basin, a small <br /> eroded anticline situated at the southern end of the Piceance <br /> I <br /> Basin and superimposed on a monocline called the Grand <br /> Hogback. <br /> Geographically , Coal Basin is located in south- <br /> western Pitkin County , approximately 4 miles west of Redstone , <br /> which in turn is 31 miles south of Glenwood Springs , in <br /> west-central Colorado . <br /> The sources of information and references of <br /> literature studies for the descriptions of the general <br /> geology and hydrology of the Coal Basin area are listed in <br /> • appendix III-C-1 . <br /> 2 . Description of area geology <br /> West-central Colorado is an area of geologic <br /> complexity . It is dll,ominated by two major geologic provinces , <br /> the Colorado Plateau", and the Rocky Mountains . The monocline <br /> on which Coal Basinl'Iis superimposed forms the eastern li?ait <br /> of the Colorado Plateau , adjoining the Rocky Mountains . <br /> The land fo-r-ms of the Colorado Plateau occur , <br /> generally , as broadlllvalleys and mesas in which the Colorado <br /> River and its tributaries , which drain the area , have formed <br /> hundreds of youthful , isolated canyons . The predominant <br /> Paleozoic , Messozoic and Cenozoic sedimentary rocks lie <br /> 1 <br />