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Li.nroln OeCorc otrserval.ion:, iu tlir sin~l~ <br />• area generally concurs r.ilh the ~lesr.ripliJn of the geol~_ir <br />formations in tl[e WESTEC re po rl Ohse rvat.ions of surface out- <br />crops an~i the single explorati~~n boring near this site in.li~alr-. <br />the [op of the basal sandstone se~~uence of the Plesa \"ei~i~~ Fc.rmai- <br />t ion, I.nown as th~~ Rc~l l ins S:uuistonr, sh~utl~l h~~ rli.u~q~~.l IJ :,I~- <br />proximately elevation contour 6080' to 6090'from 0050' a,sumeil in <br />tl,e WESTEC report, using topography provided b.' [ixl~o[: Carbon end <br />Minerals. <br />Lincoln DeFore field observations oC <br />outcrops and very shallor: test pits in Lhe dry gall}' above thr <br />proposed sediment, pond indicate the thinly bedded sandstones may <br />be found as high as elevation 6090'. Tn addition, the weather~e~l <br />sandstones are exposed on the ground surface at and above a pJar.r <br />. pole on a small ridge promontory at elevation 6070 and ext.eu~.liug <br />up to approximately 6080'. The exploration horin~ pla~~ed icy <br />I:ESTEC, in the West Yard of the Sanborn Pline ~~ncountere~i the <br />Rollins sandstone at lA feet below the ground surface or :rt.pro>.i- <br />matel}' elevation 6082' to 6087'. It is not known if this sand- <br />stone in the exploration boring is the actual top of the Rollins <br />sandstone or an eroded surface of the sandstone. <br />GENERAL AREA AND SITE GEOMORPHOi.OGY <br />Site observations and a slut> Jf lame <br />and small scale topograph}• of this site indicates t.tris t~ort.h side <br />of the cal ley is possibly Dart. of an ancient. slope failure ci~m- <br /> <br />3 <br />