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<br /> <br />co <br /> <br /> <br />D.;:.~< <br />. . . " . ~. <br />- .. <br />f:7:':':S:':'J <br />L82J <br />~ <br /> <br />EXPLANATION <br />SANDSTONE, MUDSTONE, AND Q <br />SHALE OF TERTIARY AGE Q <br />N <br />SANDSTONE, MUDSTONE. AND c;} <br />SHALE OF CRETACEOUS AGE t~ <br />SANDSTONE, LIMESTONE, c.a <br />QUARTZITE, AND SlIALE OF <br />PALEOZOIC AGE <br />GNEISS AND SCHIST OF PRE- <br />CAMBRIAN AGE <br />CONTACT <br /> <br />Ga', <br />... ~ ..~' 1\ <br />.......,... <br /> <br />o <br />I <br />o <br /> <br />10 <br />I <br />I <br />20 <br /> <br />20 <br />I <br />I <br />30 KILOMETERS <br /> <br />30 MILES <br />I <br /> <br />I <br />10 <br /> <br />Figure 6.-- Generalized bedrock geology of the Yampa River basin (adapted <br />from Steele and others, 1978). Formations of similar lithology and age <br />have been grouped to form units with similar erodibility. <br />