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i <br /> 8 Latter thi.CXness may, be' exaggerated, by fe.ulting. The unit <br /> alsc�...:cz'o ' s ou.t <br /> .., Q , ,ate..Tto�utzd .,1�'o�st�:tain in gWk, sec, 10, T 22 S. <br /> y W Y?e e i t.,...�s.t...exceee� 200 f efe <br /> .;.. .. • �. 7�:::..• . . t..fin,. thickn•esli.'; i6caus.e <br /> xg. $u " to faulting. unit i .w <br /> i t ba s:e i :•as . ..... <br /> i ;pe$ <br /> snd "js be-Jjjj4 nc r ".+'J611 the area o f 'TAr,i;:,ary rptks, <br /> in Silver Cliff. <br /> The gentral, appearance of the unit 'is Light gray, <br /> weathering to shades' of darker gray, pink, and brown, in- <br /> ' dividuai beds differ +consid'arably in the sire of their <br /> constituent fragments, but most are coarse tuffs or lapi.l,ij- <br /> stones (ternAnology of Fisher, 19619 having a predontin+ant <br /> grain size larger than 2 mm . Essential g ) quartz and ss"3nid3,zte <br /> crystals ana Pumice, and fel.site fragments- are..dor,Mn„ <br /> Accidental frbLgments of Precambrian gneiss, and, ni.crocl,i,ne, <br /> andesi,te, chert and carbonized wOOd are also an,4 <br /> ocicasionxlly predor,,i.Aant, in some beds, -7he matrix is <br /> chiefly hei ti.tey clays quartz, and an al:kalt feld�kpat. The <br /> tuffs are' believed t*6 be' rhyo l.itic` because of, the'amount.o f <br /> qu,arti and sanidi.ne presen't•i A. crude strati.fi..cation; is <br /> usually visible; some degree of sorting and- even graded <br /> bedding ,i,s presort, in some outcrops. <br /> lndivi:dua.i I-mrizons kitiLtn this unit wt:icn Are lithow <br /> logi.ca.11y-or texturally distinct, although not of great <br /> lateral extent, are noix described Jr approximate order <br />