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33Qr) <br />~s~retian iisae~e, ~ Z"aicknessl Character of Rock. <br />in feet. <br />}Attasi Ytxyolitia seriem. I 23GD ~-- <br />I-~,¢rsasdia;e seriem. <br />San Juass Seriaa. <br />San Fdi;~~ne2 Pbrmatiaa. <br />2000 <br />Aai a2tprnatioa of rhyalfte floirs arx9 tuffs, <br />the fanner prsdominatiap= near the bee. <br />Same of the this upper floxa are glassy. <br />A this mugite-andeaite sheet occurs be- <br />taeoa rhpo2ite flare 2n t2:e laser portian. <br />Z7sirteea }ausdred feet ie the maaisaan <br />thickness preserved in the quadrangle. <br />Ass alternation of andesite seed rhyolfte <br />tiara snd of tuffs containing bath racks. <br />Aadeaite flats ere uaual2y pr~tinent near <br />t}as Same. Seine of the rhyolite flows ez<e <br />glassy. The aeries is of a very irregu- <br />lar development is diftereart places. Tlie <br />sa~aismas thicknoss of 1300 Poet is foussd <br />nes+° CYphir pass. <br />Almost esoluaively ~esitiC debris. 2i88r <br />tits leans it is a we21-.stratified tuff, <br />but becosres coarser and less distinctly <br />baddod iu its upper portian. Fossils aro <br />sot kaova. The series variesgre~tly in <br />trdekarsis i'rrsa botls prisaary nausea seal <br />erasion-preaedinf, Eho eruption of the <br />IateiYCex:iate uorios. xae observed s.axi- <br />aaam Lhieisaess of ~l)C)0 feet ie present oa <br />c~-.i.a~ y. Crary. . <br />Chiet2p a coarse waglor~+erata centsf:ssissg. <br />bosrlders of grrusite, gsscima, P.1gonY.ian <br />Zpp..7Jy.HJ qua:rtzfte asxl schist, Paleozoic lisx- <br />stassea, arxS s~areiy red s;osdatosxo. In <br />67ount Zfl2san saadatone sad atwle beoome <br />predsmiaort. ;io tassci2a axe }:norm. <br />ViCp:ii~P11dIT~' <br />Incas a!uaie I ' <br />(:ring sandy shales, with 1oaa1 calcsreaue <br />iseztt4a ~ s~latones. F~braeoa t}:e Ga2o- <br />rrst9o grexsp seed cs partioa at tkse Pierre <br />diviziu» of the &oatarra. Foaei2s occur <br />spaxisst6AY• Gr~rnhaecs aerberrye and Aatraa <br />canssezta c}saructerize different 2aypre <br />aeox the base. the tall arf$inal thiaYr <br />seas of ttio f~:asseoa shale fa ao+nhere ~are- <br />aerved Sts this viciaityi isavisss; beeai, reR <br />saoved, wit3: still hi~;tsar srmtaoooua beds, <br />by ryes pre-3ea t4ixwa2 aroslon. <br />,\ <br />i'V <br />;! <br /> <br />?, <br />,: <br />"di <br /> <br />