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<br /> <br />Solido <br /> <br />I <br /> <br />1020 <br /> <br />" <br /> <br />r- <br />] , <br />'1 \ <br />, , <br />i , <br />, I <br />II <br /> <br />, <br /> <br />-tJ . <br />.~ <br />I <br /> <br />I <br /> <br />;1 <br /> <br />-~ -, <br />'. 289, <br /> <br />l~:~d <br /> <br />'" <br />" <br />~ <br />r <br />c <br />in <br />~ <br />r <br />r <br />~ <br /> <br />. J--~- ............ ....U.d.LLZ J.at.ite. De- <br />..~..,_.,- ~._..,....._. gree of weldJ.ng varies widely from unit <br />and with distance from source. Includ to unit, <br />d ff . . es several <br />name ~u .unJ.ts J.n northern part of San Juan <br />volcanJ.c fJ.eld (Olson and others 1968. S <br />, , teven <br />and others, 1974) <br />Tial INTER-ASH FLOW ANDESITIC LAVAS AND BREeCIAS <br />(OLIGOCENE)--Fine-grained to porphyritic inter- <br />mediate lavas and breccias from many local <br />centers <br />Tiql INTER-ASH FLOW QUARTZ LATITIC LAVAS AND BRECCIAS <br />(OLIGOCENE)--Porphyritic quartz latite and <br />minor rhyolite in thick flows and associated <br />breccias <br />Tos OLIGOCENE SEDIMENTARY DEPOSITS--Gravels, water- <br />laid tuffs, sands, and silts in various strat- <br />igraphic positions within the volcanic sequence. <br />~ Coarse gravels northwest of Parlin consist <br />- ,:J .IT principally of Precambrian rocks derived from <br />l2e:DcIt1I1V41V.~ Sawatch Range I <br />.~..MIDDLE TERTIARY INTRUSIVE ROCKS (MIOCENE AND <br />OLIGOCENE)--Granodioritic, quartz monzonitic, <br />and granitic rocks in stocks, dikes, sills, <br />laccoliths, and irregular bodies <br />- Dike or sill <br />Tpl PRE-ASH FLOW ANDESITIC LAVAS AND BRECCIAS (OLIGO- <br />CENE--Vent-facies lavas and breccias at numer- <br />ous widely scattered volcano sources surrounded <br />by coalescing aprons of volcaniclastic debris. <br />Includes extensive bodies of San Juan, Lake <br />Fork, Conejos, and West Elk Formations as well <br />as many local units <br />Twm WALL MOUNTAIN TUFF (CLIGOCENE)--Reddish-brown <br />densely welded mcderately crystal-rich rhyo- <br />lite ash-flow tuff. Maximum thickness about <br />500 ft (150 m), ~ut genera~~y is ~OO ft (30 m) <br />or less. Tuff is of'Sawatch Range provenance <br />and older than the tuffs of San Juan provenance; <br />preserved in quadrangle only in small bodies in <br />Arkansas River valley and Mosquito Range <br />Tg GREEN RIVER FORMATION (EOCENE)--Marlstone, oil <br />shale, siltstone~ and sandstone. Thin bodies <br />near northwest corner of quadrangle are near <br />the southert depositional edge of the formation <br />Tt TELLURIDE CONGLOMERATE (EOCENE)--Light-gray to red <br />conglomerate, grit, and sandstone, and lesser <br />quantities of mudstone and shale. Maximum <br />thickness about 500 ft (150 m) <br />WASATCH FORMATION (EOCENE AND PALEOCENE)--Varie- <br />gated claystone, siltstone, sandstone, and <br />conglomerate. Maximum thickness about 1,800 <br />ft (550 m) . <br />OHIO CREEK FORMATION (PALEOCENE)--Sandstone and <br />conglomerate. Thickness about 400 ft (120 m) <br />Two WASATCH AND OHIO CREEK FORMATIONS <br />TKtc TELLURIDE CONGLONERATE (EOCENE) AND CIMARRON RIDGE <br />FORMATION (UPPER CRETACEOUS) <br />Cimarron Ridge Formation--Interbedded rhyodacitic <br />conglomerate, laharic breccia, and flow breccia. <br />Maximum thickness about 600 ft (183 m) <br />TKi LARAMIDE INTRUSIVE ROCKS (EOCENE, PALEOCENE, AND <br />UPPER CRETACEOUS)--Granodioritic and quartz <br />monzonitic stocks, sills, and dikes <br /> <br />-' <br /> <br />~_. ~ ,--...- <br />'_ ~':;.:7::-- <br /> <br />~ <br /> <br />rHt-" ("H. 0-:-; 11 <br /> <br />