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`cults , there is an association in the first , second and <br /> third north. entries of the Dutch Creek No . _ mine entry , and <br /> in the drainage of Oilwell Creek between the No . 3 and No . 15 <br /> mine entries . <br /> Faulting is a significant determinant of the <br /> drainage pattern in the Coal Basin , having directly or <br /> indirectly controlled Bear Creek, all forks of Dutch Creek, . <br /> both forks or Oilwell Creek, the south and north forks of <br /> Coal Creek, and Porcupine Creek. Drainages above the bottom <br /> of the Rollins Sandstone are strongly influenced by faulting <br /> throughout the basin, although such influence cannot be <br /> traced in the underlieing shales . <br /> In common with other unroofed '_accoliths of <br /> the area , the Coal Basin features , in addition to the dikes, <br /> a large area of baked shale near the center and numerous <br /> apparently hydrotherm-al calcite veins . Moreover , the effect <br /> of the igneous intrusion has apparently been a general <br /> upo_ading of the coal rank in the basin. . <br /> C . Geologic stratica, <br /> The strata of Coal Basin consist , principally , <br /> of Niancos Shale and the Mesaverde Group , in which the coal <br /> seams occur . (See Figures !!I-D-1 and ill-D-?) The <br /> ilancos Shale is impermeable, and lies in a bed of 3 , 000 ' <br /> this-kness , beneath the Mesaverde formation. ihE coal sea^is - <br /> overlie the sandstone members of the Mesaverde formation , <br /> which is Wade up of a series of shale , sandstone had coal <br /> *Also , see Par . 4 .b . of Section II.I-C for drill hole locations <br /> and data . <br />