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<br />l"': <br />00 <br />11" <br />- <br /> <br />c. <br /> <br />. <br /> <br />. <br /> <br />7 <br /> <br />GEOLOGIC AGE <br /> ROCK UNIT <br />ERA PERIOD <br /> All uvium <br /> S-U:t, .6and, and glLa.vel. .in 6loodp.ea.i.n 06 Yampa. /U.VeIl.. <br /> Landslide deposits <br /> >, Cohell.ent: gUde bloc/u, to he.tell.ogeneoUl> mixtwLu 06 <br /> ....' <br /> "' <br /> <:: angul.a.Jr. JLOC~ 6ILa.gment.6; .inc1.u.du .ta..f.u.6 depo.6.i.t .in <br /> .... <br /> OJ CIlO.6.6 Mounta.in Canyon and ]unlpell. Canyon. <br /> .... <br /> "' <br /> ::> <br /> CT <br /> Terrace deposits <br /> , <br /> SU:t, .6and, and glLa.vel.; ca.p.6 .6eveJta.l. und.i66e1l.enti- <br /> lLted .6tJta.th and pediment .6U1t6acu .in Yampa /U.veIl. <br />u va.U.ey ; o to about 30 6ee.t tlU.c~. <br />..... <br />0 <br />N <br />0 <br />Z <br />..... Brown's Park Formation <br />u <br /> u.ght-glLa.y to whUe 6.ine- to mecUum-gl!.lU.ned .606t <br /> 6k.ia.ble ~o.6.6bedded .6and6tone conta..inlng .6ma.U. <br /> amoun.t6 06 co nglomeM.te; .inc1.u.du tlU.c~ even.e." <br /> bedded Ught-glLa.Y c1a.yey .6and6tone along Yampa. <br /> /U.Vell. .in T. 6 N., R. 97 W., and a 6utoon-~0.6.6- <br /> bedded 6auu .in the uppell. paJtt i.6 pClll..Ucu1.aJLty <br /> >, weU. expo.6 ed .in ILoadcut.6 .6 outhwut 06 Mayb eU.; <br /> .... <br /> "' ba..6al paJLt i.6 conglomeM.te cOYL6i.6.t.i.ng 06 pooll1.y <br /> ~ <br /> .... lltlU.6.ied pebblu, cobblu; and bouldeJr..6 06 llme- <br /> .... <br /> OJ .6tone, dolomUe, cheJtt, and lU.6VL amoun.t6 06 ILed <br /> I- <br /> congtomelUl..t.i.c .6and6tone, 0 to about 135 6eet tlU.c~ <br /> but aVVUlgu between 40 and 90 6eet; owlng to VLO- <br /> .6lon, olLi.g.inal tlU.c~ne.t>.6 06 60Juna..t.i.on i.6 un~nown <br /> . but a ILemcU.n.i.ng tlU.c~nU.6 06 a..6 much a..6 1,500 6ee.t <br /> i.6 pIluent: ea..6t 06 CJto'().6 Mounta..in. <br /> . Lance Formation <br /> u.ght-glLa.y and yeU.ow.il.h-bllOwn mlL6.6.ive ILUi.6ta.nt: <br /> . .6and6tone .6epalla.ted b!, tlU.n bed6 06 .606t muddy <br /> en .6and6tone, .6.u.t.6tone, glLa.y .6ha.!e, and coal. About <br />u ::> 1,100 6ee.t tlU.c~. <br />..... 0 <br />0 OJ <br />N U <br />0 "', <br />en .... Fox Hills Sandstone <br />..... OJ <br />~ .... <br /> u GlLa.y and bu66 lenticul.tvt .t>a.nd6to ne. Ba..6 e 06 lOWVL <br /> ILUi.6ta.nt: .6and6tone i.6 contact w.i.th undeJr.!y.ing <br /> L ew.i.6 Shale. About 400 6ee.t tlU.ck. <br />