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asau+KBn`!�'A�..:.R.ri3su.+.au..w..e...wa..x..e+w.w..w..n.a..ww>..a.�..........-..-x....,.....,......«.w.. . ......«.......e................ ... ..... .. .........-....i ....« .... .-......v..,.....,_..................,,... ......«......«.....M................»......ervw <br /> Tbtrti.ary Succe.ssturr at Sliver Cliff on his geo .; . map, artd <br /> he -Aamed' the succe,ssiot "rhyalirte." However, he did <br /> identLfy soveral different rack units Ln th© body of hts <br /> report (p.. 394-403) . <br /> i <br /> In the ptasent 'study, the Precambrian rdckr, are, left <br /> undi.ffe;eOntiated, but six rock units, some with isubdivisions , <br /> are recognized in the I'eraary volcanic sequence, use <br /> g units are arranged in stratigraphi.c order in figure 20 and <br /> are used on plate 3, <br /> ftecambri.an' Rocks <br /> A complex series of mostly metasedimen:tary :recsxbr'l r. <br /> rocks forM the basement around the district and I,ni:l�td.e inter. <br /> layered horr►bleadi--Sneiss, granite-gneiss, peSmstite, 'rxld <br /> mi.gmattte. St;eeply di.ppi.ng, northeast-striking, sfeni:te <br /> dikes of I.at•+e Precambrian age intrude the older foliated <br /> ' gstei.sses,. r <br /> The Tertlary-rPrecambrje�n cor tact, where exposed :s <br /> partly fatxIted, and partly dep+„siti,onal. <br /> le <br /> .ttiLtZ Rorer <br /> The Tertiary is re*iresentsd by ex,rusi.,ve-.V. o.?caxiir rocks <br /> aand epi;cl.astic Ydlconic sediments with a small number of <br /> hypAbyssal domes', .dukesv and sills. With uati-or exceptions,' <br /> these are all mi,ner>a logical iy rhyoli,tes and are probably'. <br />