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<br />1-' <br />Cf.\ <br />~ <br />".."" <br /> <br />110. <br />(;61 <br /> <br />EXPLANATION <br /> <br />I QUATERNARY DEPOSITS 7 UPPER CRETACEOUS <br />ROCKS-Excludes <br />2 VOLCANIC ROCKS Mesaverde Group <br />3 MIOCENE, OLIGOCENE <br />AND EOCENE ROCKS <br />4 EOCENE ROCKS <br />5 EOCENE AND PALEO- <br />CENE ROCKS <br />6 MESA VERDE GROUP <br /> <br />I <br />I <br />I <br />43'/ <br />, <br />, <br />01" <br />:::,~ <br /><'~ <br />8/0 <br />" <br />, <br />42'---t- <br />I <br />" <br />/" .' <br />~:~14 <br />""0, <br />;;;',., <br />,~ <br />I <br />41'/L <br /> <br /> <br />10 <br /> <br />8 LOWER CRETACEOUS <br />ROCKS <br /> <br />9 JURASSIC, TRIASSIC. <br />AND PERMIAN ROCKS <br /> <br />10 PERMIAN. PENNSYL- <br />VANIAN, MISSISSIP- <br />PIAN, AND OLDER <br />ROCKS <br /> <br />11 PRECAMBRIAN ROCKS <br /> <br />NUMBER INDICATES HYDROGEOLOGIC UNIT IN TABLE I <br /> <br />lOS- <br /> <br />,/T'~,,~, <br /> <br />3 6 107' <br />3 . <br />h <br />", 106- <br />1 WYO~!NG T-- <br />COLORADO <br />) <br /> <br />111:....-1" <br /> <br />11 <br /> <br />/' <br />( <br /> <br />5 <br /> <br />Ii" <br />.. \...., <br />l~j <br />...J <br />J <br /> <br />, <br />I <br />'''\ I <br />" 9 ~ <br />""14 : <br />" 10 C'-N <br />" ~ <br />3B\...."r.~t' <br />I <br />18 ''Z <br />:::,< <br /><,"'- <br />"'10 <br />;;;'..J <br />,0 <br />,u <br />-- ---L___ ___ L___ ___lL___ ___L______.L______L <br /> <br />o <br />I <br />o <br /> <br />40 <br />I <br /> <br />80 MILES <br />I <br /> <br />I <br />40 <br /> <br />, <br />80 KILOMETERS <br /> <br />Figure 2.--Hajor hydrogeologic units in the Upper Colorado <br />River Basin (structural features not shown). <br /> <br />13 <br />