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T 1042 ►9 <br /> 250 ;f. +bet thick in the Geyser mine-, shaft `. ninon ,...1$96, p8 <br /> 455). At rahts with ,slight argu.l.ar tuzcor��vr�,i.�Y .upon .the <br /> rhyolite tuff, breccla ;and ccfjjgiamere�e;.;�nit` tha':No,� axiit <br /> sandstone <br /> units; and it' dips. gently.= .Wlt~h"inim •� <br /> ' rregtildrities , <br /> to the west. lr is f e <br /> befievd`: o>:h ' ';€ +axed-_..f m i <br /> ve <br /> dome on Round Ibunl Lain and possibly- alsos from aMther. vent <br /> ixt NWT, sec. 15, T. 222 5. , R., �2 W. <br /> The lava f1014 may, be separated into :thre*4 vertiC4l zones <br /> with transitional boundaries (the flog is designated Tr and, <br /> the tWo lower zones by syrabo is in plate 3). `sae upper and <br /> thickest zone is, 4 prominently flow-layered lithoidal rhy*- <br /> lite which is welt. E�kposedi but altered,: in the S I.ver Cliff <br /> qup-rry in S"y: 3 d , , sec. 15, T. 22 S. , . R. 92 w*, -hare .it is <br /> about 150 feet .thi-Pk (sae• fig. 2�). The flow -is locally, <br /> autritrlasti c, particulatly near 'the`:,vent on Fund Ibunta.in. <br /> The lava is vety pale orariger=tor "-Xiiht brawn= gnrt has 0d4L' cn- <br /> a1 small less t? an 2 m in, diaMeter) pheraocrys.ts'-Qf sansd�.na <br /> Pnd quartz in a fine- '-rained -groundmass. In thin-sectlor�, <br /> the $sou ndWA3$ has a f+elsi.tic• t4&tiiri, with- - quartz, ' alkjl.t. <br /> fsalds ar,_ ante var�r .rg.allOunts:=vf sericiteg liz��nite, and . <br /> he=tite "dus.tr,tr A- few small l�.ttophyfsae contain chali�eduny, <br /> q-%;artz, and a pale pink garnet w-hi:C11 is pro 4aIbly spessar;ti,tc... <br /> Towards the, base,.o f:•this. zoav; small seat*e'~ A <br /> 4ed" spherulites <br /> bogie' to appear. 'and they increase ir. ,size -and ,niL"ber 3xiCo <br />