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<br />-5- <br /> <br />] I . GEOW:;Y <br /> <br />~G~"ol ogic_Fe_il_t~!:.e"~ <br /> <br />The Gore Creek basin, alonq \'Ii th the Ea(jle and Piney Rivers dt'ains <br /> <br />t 1e \'Iest side of "the Gore Ranqe. ';"hE' Gore 11anqe is one of the major <br /> <br />Illissive uplift sections of Precambrian cy'ysta11ine rock typica'l of the <br /> <br />munta i nous reqi ons of Color'ado. The upl i HE'd fault b 1 ad fomi ng the <br /> <br />Illi'in element of the ranqe is flanked by metamorphic qneisses and by the <br /> <br />s,,,d imentary forma ti ons l'xtendi nlJ I'IE'S twaY'Cl. The two major fau lts fl a nk i n(j <br /> <br />tle Range are the Gore Fault which bears roughly north-northwest and the <br /> <br />F-ontal Fault which trends a,pproximate'ly pal'allel. The Precambrian 0'.1- <br /> <br />s:a11 ine rocks forming the core of the ranq" are 'intensely fractured and <br /> <br />sub-divided into many snail b"locks by l"I,merou; faults. <br /> <br />B. Gore Fau It <br /> <br />The Gore Fault can be easily ;dentified in the field as it is hiqhly <br /> <br />visible traversing through the area east of the top of Vail Pass then <br /> <br />northwestward through Main Gore Cr~ek. ~~st\'lard of the fault, the sedi- <br /> <br />ml'ntary rocks of the Minturn and f'1arooll FormiJ"~ions at'e very E,vident. The <br /> <br />f~inturn Formation can bE'identified by the d'istinctive beds of coar'se <br /> <br />gl'ained gray to reddish sandstones,::onqlomerat'ic sandstone, sandy and <br /> <br />silty shales as well as the pinkish gray ~o gray limestone beds. <br /> <br />C. Maroon and Minturn Formations <br /> <br />The Maroon Formation conformably overlies the Minturn Formation. Fhe <br /> <br />Maroon Fomation consists of r'ecl D!I;dstone or ',hall', siltstone and fine- <br /> <br />grained sandstone. The f'laroon FOY'filaLiop "is ":n depositional contact Vlith <br /> <br />the granitic Precambrian crystalline rock5 near the upper end of the Piney <br />River alonq the Gore Fault,16 <br />