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C . General Description of Geology and uvdrologv <br /> 1 . introduction <br /> The Mid-Continent coal Mining operation extracts <br /> coal from the Cretaceous strata in Coal Basin, a small <br /> eroded anticline situated at the southern end of the Piceanca <br /> Basin and superimposed on a monocline called the Grand <br /> Aogback. <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 17T-C-1 . <br /> 2 . Description of area geology <br /> :lest-cer_tral Colorado is an area of geologic <br /> complexity . it is dominated by two major geologic provinces , <br /> the Colorado Plateau and the Rocky .fountains . i'he monocline <br /> on which Coal Basin is superimposed forma the eastern limit <br /> of the Colorado Plateau , adjoining the kcckv Hcur_rains . <br /> The land forms of the Colorado Plateau Occur , <br /> generall;•T , as broad v alle;s and mesas in %�7,nich the Colorado <br /> River and its tributaries , which drain the area , have icrmeu <br /> hundreds of youthful , isolated canyons . The predominant <br /> Paleozoic , Messo7.oic and Cenozoic sedi'maentary rocks lie <br />