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<br />-- <br /> <br /><- <br />o <br /><II <br /> <br />~ <br /> <br />'" <br />'" <br />'" <br />III <br /> <br />'Tl <br />- <br />" <br /> <br />PllRRI:: SHALE 'UPPER CRETACEOUS} _ Thin hC'nlllnil(' Cd.IY) <br />laycrs common in form..1ion. Shalt' and hcntonill' bl"d... h:l\'(' <br />potential of swcllinf!: when welled and shrinkinl; when dried. Con- <br />l'rclions contain rnarint' fossils. Thickness 6.200 feci <br />Upprr Iransilion member - Olive-r:ray shale, Ont-J!r:lined blllwn <br />s.andslonc layers C'onlainin~ hard 4.fool brown sandstom.' con- <br />('rclions. and int('tbcddcd yellowish-brown 10 olivc-~'3Y sillY <br />sandstone and sandy shale conlainint; limestone and ironslonc <br />concretions. UndcTIYln~ olive-I!r..y claystone contains ironSlone <br />and limeslone concretions. larJ!c limestone m::JSscs called Tepee <br />BUlle limestone. :In informal n:lmt'. lie bctwten lone of Bocllli,rs <br />f.'IiDS; and zone of BQC'ulitf's sroll;. Thin sands lone ,",ed in wnl' or <br />Dldymocnas c11t~}'~nn~ns~. At base is yellowish-brown sandy sill- <br />slone cquilvalcnt to upper part of Iy~ Hy~iene Sandslone Mcmber <br />HYf:!lcm' Sandslone Member - Yellowish-gra)' or olive. brown sand- <br />slone <br />lower pari - Olive-fray cl;.I)'ey shale eonlaininf iron!olone and <br />limeslone concrellons <br />t~a:1 NIOBRARA !'ORMATION (UPPER CRETA<TOUS) , <br />Smoky HIli Shale Member - Pale. to yellowish-brown 'iofl Ihln- <br />bedded calc..reou!o shale and interbedded Ihin layers of limeslone. <br />Three ridl!e-formin~ beds: ycllowish-orange chalk at lOp. ydlnwish. <br />f:!rilY chalk)' IImestnne in middle. :Jnd ~ra)' soft rl:Jlr IImcslun.: in <br />lower Ihird. Conlains man)' bentonite beds. Contains marine <br />fouils. Thickne~~ 41 0 reet <br />ron Hays lime' 10m' Member - Yl'lIowish-gray dense hard lime- <br />Slone in beds 1-' feellhiek. Thin shale beds mah up unl~. abuut <br />5 percent of Iht." m\'mber. Contains marine rossih. Thickm'ss 35 <br />fe('t <br /> <br /> <br />(!Pu~~~1 <br /> <br />IKPb I <br />L ."1,':'] <br />, ,11:"'" :,',i <br /> <br />~ <br />~~2iJ <br /> <br />QpP <br /> <br />Qp <br /> <br />'" <br /> <br />" <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />POST.PINEY CREEK ALLUVIUM (UPPER HOLOCENE) - D..k. <br />pay humic sandy to gravelly alluvium containing sticks and rools. <br />Only along major streams where il forms nood plain and one or <br />rarely two terraces less than len feet above stream level. Lies <br />within channels cut into Piney Creek Alluvium along arroyos and <br />valleys. but overlies Piney Creek Alluvium where arroyos arc not <br />cut. Underl.:lin by older graveUy alluvium along large vaUeys. <br />Thickness aboul S-15 feet. MO$I seasonal noods cover Ihis unit <br />PINEY CREEK ALLUVIUM (UPPER HOLOCENE) - Dark.gray 10 <br />reddish-brown humic clayey silt and sand containing layers of <br />pebbles, generally in lower rart. Undr-rlain by older graveDy allu- <br />vium or bedrock. Grades upslope inlo colluvium. Contains UP(lC1 <br />Holocene weak Brown soil in upper p:ut. Thickness 5-20 feet. <br />TerT2cc is 10-20 feel above mndern sITeams. Generally not covered <br />bv scasunal noods 0 <br /> <br />.. <br /> <br />- <br /> <br />010 <br /> <br />Os <br /> <br />I 0.2: I <br />I Osl I <br />I Qc I <br /> <br />NOTE. <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />LOUVIERS ALLUVIUM (PLEISTOCENE - BULL LAKE GLA- <br />CIA TION) - Reddish-brown pebbly 10 boulder)' alluvium alon~ <br />permanent streams and sandy to cbyey alluvium alonr: intermit- <br />tent streams. Coarse alluvium is stained by manganese and iron. <br />Thickness probably more than 2S feet. Terrace is about 65 feel <br />above modern streams. Strong Brown soil of post. Bull I..h pr~ <br />Pinedale age in upper part. Alluvium conlains fossil mollusks. <br />Six-foot boulders in torrential nood deposit belween Bear Creek <br />and Turkey Creek resulled from nash nood during capture of <br />Turkey Creek by smalluibutary of Bear Creek. Turkey Creek in <br />pre-Louviers time nowed southeut from gap in Dakota hogback <br />SLOCUM ALLUVIUM (PLEISTOCENE - SANGAMON INTERGLA- <br />CIATION) OR ILLINOIAN GLACIATION - Moden'...eddi,h- <br />brown pc:bbly silt and clay interlayered with gravel. Gravel con- <br />tain$ larger and more abundant boulders near mountains than to <br />east. Stones are altered by wealhering and are coaled by calcium <br />carbonate. Thickness probably averal!es aboul 15 feet. Contains <br />fossil mollusks. Upper part of mosl deposils is overbank sill on <br />which a very strong Brown soil of pre-Bull Lake (Silnpmon?) age <br />is developed. The 8 (clay-cnrichcd) horizon of Ihis soil commonly <br />has a high sweU pOlential <br />Lower of Iwo terraces or rediments lies about 100 feet above mod- <br />ern stream <br />Upper terrace or pediment lies about 120 reel above modern slream <br /> <br />. <br /> <br />,-.. <br /> <br />COLLUVIUM (UPPER HOLOCENE TO PLEISTOCENE) - OIrk1l'"Y <br />10 reddish-brown bouldery to sandy silt and clay on slopes in <br />mountains and plains where it was deposited by p.ravilY and sheet <br />wash. Grades downslope into Piney Creek Alluvium. Locally con- <br />tains some alluvium. Generally thicker than S feet. Ran~es in age <br />from Holocene to prC'-BuU Lake; most is Piney Creek OJ Louviers <br />in a~e. Contains soil in upper pari <br /> <br />. <br /> <br />ONLY THOSE MAP UNITS IN THE IMMEDIATE <br />VICINITY OF THE RESERVOIR ARE DESCRIBED. <br /> <br />DESCRIpTION OF MAp UNITS <br />MORRISON EXCHANGE RESERVOIR <br />