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<br />. <br /> <br />"'..' <br /> <br />.-' " d rA-/J4) <br />\,~v'.-'_. <br />Geolooy __--- <br /> <br />, <br />- <br /> <br />.As me:.~t i BFi=-~9 pn:~v if"lII.s..Ly.., lhe Southern Rocky M::Iunta i n Prov i nee <br /> <br />Is a rugged zone of north-south trending MOuntain ranges which form <br /> <br />a con1'inuous belt across central Colorndo. The typical mountains <br /> <br />have cores of igneous and meta,"orphic rocks and they originated by <br /> <br />repeated upl ifts of igneous rocks through the sedimentary rocks <br /> <br />that were once continuous across this mountaineous region, The <br /> <br />uplifted rocks have been modified through the ages by glaciation <br /> <br />and other forces of erosion, Steeply dipping sedimentaries sH11 <br /> <br />flank the mountains and extend eastward under the Great Plains and <br /> <br />westwi"lrd under the Colorado platp-~\l. <br /> <br />The repeated uplifts combined with erosion have removed nearly <br /> <br />all evidence of the sedlmentaries from the mountain province, <br /> <br />Exceptions occur within the South, Middle, and North Parks and <br /> <br />the San Luis valley which are structural basins resulting from being <br /> <br />Inactive during the periods of uol ift. Sedimentary rocks, mainly <br /> <br />shale, sandstone, and siltstone, are found in the three parks whi Ie <br /> <br />the San Luis Val ley has been fi I led with alluvium (sand, gravel, <br /> <br />and clay), <br /> <br />. <br /> <br />0359 <br />