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<br />. <br /> <br />. <br /> <br /> <br />GEOLOGY OF GREEN AND YAMPA RIVER CANYONS <br /> <br />687 <br /> <br />I <br /> <br />SYS- SEll GROUP COLUMNAR THICJlo CHARACTER OJ;' THE SEDTI.lEI/l'S <br />IT'" JJ;'.S, FORUATION ,.SECTIIlON .W.sS, .-""---". <br /> - - -..... <br /> ~ - - -- Dark hard siliceous marine shale that <br /> - - - - - <br /> - - -- weathers -silver-gt'"ay and--contabls-..abund.. <br /> - - - -- <br /> m ,140WI7 -- --... 12~ ant fish scales:.. A few feet of darker <br /> 0 <br /> ! -,- -- satter shale beneQth may represent a <br /> ----- <br /> ---- <br /> - --- thin layer of The~opo11s. <br /> - --- <br />I - - -- <br /> - <br /> . . ~ .' .' .' <br /> ... ... .... Yellowish em ss-bedded samdstpme and con- <br /> j .~.-.-;."".: <br />11 Dakota .:":-::: :~; .;.~ 48 glomerate at top. White and black chert <br />Sands ton and gray limestone pebbles less than one <br /> ~ .. .... inch in length. Calcite seams are abund <br /> ,'. ~. ~ .. .... <br /> ",:1 --- - and. Carbonaceous shale streaks occur.. <br /> rl 'Fuson Sh -- - - - 36 Dark gray to reddish shale <br /> - ~=- <br /> i ~ ~ Lakota - - Yellowish siliceous (quartz! tic) sandstone <br /> ~ Sands ton - -- 18 Both sandstone members carry fossil woo~ <br /> H '~'. .... : :.: <br /> Unconformit .io!..... .. <br /> ::r-"':c ::. A succession of varicolored marls, sUt-- <br /> ~ ..r~ stones and brownish cross-bedded poorly <br /> . ~ ;. . ~'.!-.A sorted conglomeratic sand$tones c8J;'ryi~ <br /> ~-:'''''.f .',' abundant dinosaur remains, silicified <br /> ~.... .... <br /> "'- wood and fresh-water clam shells. "Rai <br /> }\:orrison .:J--1: X 756 bow beds.1I Occasional limestone and <br /> _L.._ <br /> '~'::."."'~.~. chert layers. Geodes and concretions <br /> are connnon. A series of' lake, stream" <br /> .. .... flood-plain and possibly delta deposits <br /> ---- <br /> . ' <br /> ..........;.. Kay include some Wind-blown sand. <br /> ',-.. ..~.:~..-.~: ".::'.. <br /> , <br /> 0 Greenish gray glauconitic quartz sandstone <br />" ," " ." <br />H m .. .. <br />i m at base; shales and oolitic sandy lime- <br />~ Curtis ~~~ 26() stones in upper part. Marine peleqypods <br /> gastropods and cephalopods in upper two <br /> J...c~_ thirds of the formation. <br /> ~ I . ~ .... <br /> :, ~ " .. < ' . <br /> '" II ~. : .' II \' <br /> /;l ~\::'~ ~" :/~~.~:~:~ Light gray to buff and pink medium.grainec <br /> J Entrada 165 uniform quartz sandstone. Eolian. N!) <br /> \~Y0;~ foasils observea. Smooth dome-weather- <br /> ing. , <br /> j, ~-i'~ Red ail tstona and shale.. Marine pele~. <br /> Carmel ~:?:r.~ 125 pods ab~dant north of Vernal. (outsidS <br /> -.l_._. monumen. Also gypsum. Thins east: <br /> uncouf~rmity.<. _'1":~::--'~':': and peco;nes more. arenaceous. .Qccaai <br /> t ' -..'-'- three-toed dinosaur tracks. <br /> <br />TABLE I (conlinued) <br />