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<br />111° <br />State base maps 1:500,000 <br /> <br /> <br />109° `?' 0e° <br />??soh ?ao° <br />•105a EXPLANATION <br />.ar MANGOS SHALE AND <br />EQUIVALENT ROCKS <br /> <br />0 50 100 ISOMILES <br />0 fi0 100 150 MLOMETERS <br />Figure 3. Major exposures of Mancos Shale and equivalent rocks in the Upper Colorado River Basin (modified from Rocky Moun- <br />tain Association of Geologists, 1972). <br />Development of Water Resources 7 <br />110. <br />C <br />w