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• • <br />S Oal <br />0 <br />e <br />~= <br />Explanation <br />ALLUVIUM. Stream and Ilood plain deposile. <br />IGNEOUS ROI:KS. Intrwire dlkaa, plugs, and sills of andesite, <br />doeite, and latite. Eslrusiw basaH Ilowa end <br />beccios, ondssile cinder cones and seaioe. <br />BROWNS PARK FORMATION. Sondtlone and conglomerot• up to <br />2000'thiek, ganerolly about 200' Io 800' thx <br />LANCE FORMATION. Mostly whole with occasional sandsl0nr and <br />opal bade, 1000' to 1500' thick. <br />:; Kla :::, <br /> <br />e <br />u` <br />LEWIS FORMATION. Chiefly shale, ISOO' l0 1900' thick. <br />WILLIAMS FORK FORMATION. Interbedded aondatoM, whole o~ <br />coal, 1100' to 2000' thick. Krl - Twardymilr <br />sandstone member near middle o} lormotion. <br />I(K' ILES FORMATION. Sandatona and shale, coal in upper port, IS <br />KI thick. Kit -Trout Creak •onddone member o' <br />top of lormation. <br />MANGOS FORMATION . Mostly shah, 4900 thick, Includes <br />Banton, Niobrara, and Frontier Formotiona. <br />_~3eeecv II YnY <br />LEGEND <br />^ - - ^ - • ~ n v v w <br />From Colorad~ 'aolopical Surrey , Map Seria^ I , Routl County. <br />.re rr rr rr <br />ear rr•ea . <br />Conlod <br />Nigh Angle Foull -T- <br />Anlidine ---1- <br />Srncline --T <br />l <br />SCALE <br />O 1 = ~ 1 a 6 YIL[a <br />o l: a• a s r s t to IuwLrcrus <br />c.,.ar <br />~M CnerN ti Yq <br />COLORADO <br />FIGURE 6-1 <br />GEOLOGIC MAP <br />of <br />SENECA II MINE <br />and thr rroundlnq Area <br />