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<br />11 an area to afford solutions to asanp of the problems in the earlier Geologic <br />_ .,. . <br />t~l ~~ - <br />1 ; .' <br />~ <br /> <br />velopsneat of this most interesting fieid.° ;; <br />: <br />t! <br />°The amount of Tertiary and. recent aroslon which has takon place in the ~ tr3 <br />llurfde Quadrangle from the Dakota plateau to the aursait of fott. Filson is S2S0 <br /> ~~ <br />et verticaily, and a great thickness of ati31 higher volcanfca a°aat sti21 be <br /> <br />ed.° xxxxxa `.; <br /> <br />°The Te33uride Quadrang}e affarda a etrikiag instance of the dependence r <br /> <br />~' <br />h sio h u as eola ilxe stro 1 contrasted h sical features of the <br />P Y ~'aP Y P S gY• n8 Y P Y <br /> .; <br /> <br />za s+hfch hzve already been acerationed~ are coat iatira:tely relsted to contrast- 1i <br />geologic features. The mountains and valleys are the result of long continued V <br /> "6 <br />osfon of a past of the San Juan volcanic plateau end of the older foraationa sF <br />i <br />I; <br />neath it; and it is posaibie to recognize the relation between rainy of the phy- <br /> .,, <br />,„ <br />'cal fcatupea and the character and mode of occurrence of the .different rock man- 'tj <br /> ~ <br />s which have been dtacribed.° ~S x x x z s " <br />ii" <br />°The Surveq of the Telluride Cuadrangle hen brotkht to 11s>ht acany lines '„'. <br />i~'' <br />_ , . <br />evidence, which +shen fol2ored out tl^xough ad~oininj, dia8rictn m411 lead to a ~`~ <br />+ ch better uuderstr~adfrr; of the coacplicatcd geologic history of the San Juan.° 4 <br />~`, <br /> <br />The geolossy of Savage 3asin io in a sense ainsp7x, i.e., it lien wholly °: <br />~ :' ~' <br />L. <br /> <br />thin. the eruptive rocks that still rac~ain as evidence of tho c}aaractar and i <br />i'{ <br />~~ i <br />;aitude of the volcanic eutbursta. The Saar Juan aeriea~ Interraediato serios <br />; <br /> : <br />, <br />d ~otoai rhyolitic aeries shown iia'generalized naction ttay 'he classified as <br />I <br />desitic Dreccias~ Au,Jite -AaMasita :nd RhyolitP,rcapectively. ~ <br />ti <br />~'' <br />The approach to Savage basin in by wsy of Pando3^a and up !larahall. creak. ~ <br />~i? <br />~ r+t~ <br />_ <br />s tern °up :3areha7.1 CreeY.° is cartsinly spplicable to thie ,3ulah or canon. In ~.+ <br />ctraf,;3xt line t}ae rise in dearly 3QC0 fast fn about a m11e, The tra11 howavnr~ ~ 1r <br /> B <br />mountain parlaacm fa good. Although the Canon oP Sdarahall Creak to aoasrxhat <br /> <br />rrom the trail a9K-zags bacY, azvi forth betbtcn the precipitous+~malla and gains ~ ,j <br />Y <br />;, .t <br />~~"~ 1 <br /> 1~' <br />,; <br /> 1° <br />; <br />i ~~ <br /> t <br />a <br />I <br />