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e <br /> fD 0 <br /> Top of Dakota Absent at Mine Site <br /> ® Quaternary <br /> Deposits <br /> GO - <br /> o Conglomerate <br /> L - - - - - - <br /> Sandstone -' _--- - ----- <br /> Rider Seam <br /> t=— ' <br /> Sandy shale — — — — #1 (Upper Dakota) r <br /> Shale #2 (Low-- Dakota) <br /> Clay <br /> ® Calcareous — <br /> Ironstone — — — — — — — <br /> Concretions #3 (Nucla) <br /> — Paleochannel <br /> VEPs'ZCAL SCALE: — — — — — <br /> 1 inch = 20 feet — — — — — <br /> 50 feet — — <br /> J 7 (?) Unnamed <br /> - — — ` Uncor2or ity n <br /> L 10 <br /> Figure 6-2. Generalized Columnar Section of the <br /> Dakota Sandstone at the Nucla Mine, Montrose co,-ity, Colorado. <br /> 6-14 <br />