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<br />u01906 <br /> <br />associated camping and picnicking. This park is operated primarily as a seasonal facility. <br />(Mancos, 1994) <br /> <br />The reservoir has a surface area of about 216 acres at total capacity. The reservoir is stocked with <br />trout by the Colorado Department of Natural Resources, Division of Wildlife. There are many <br />good camping and picnicking sites, and hunting for deer and elk in the area is permitted in <br />season. Initial funding and construction of recreation facilities was provided by Reclamation; <br />currently Colorado Parks charges day use and overnight fees and provides funding for facility <br />operations. <br /> <br />These carriage contracts will not have an effect upon recreation activities or operation of the <br />State Park at Jackson Gulch Reservoir. <br /> <br />3.5 Geology and Soils <br /> <br />3.5.1 Geology <br /> <br />:r'- <br /> <br />The geological history of the project area is briefly outlined, ']:'h6 Mancos Project lies within a <br />region of intrusive Tertiary igneous that has been modified by Paleozoic sedimentation <br />composed of marine limestone, shale and.,&andstone. The entirexegion was elevated above sea <br />level while the area north of the La Plata mOt:mtains was folded into a large elliptical dome. <br />Following that uplifting phase, erosional detJifus from this mountain complex was laid over the <br />tertiary continental deposit, until the entire region, wlt~;'e](ception Qi the low lying mountain <br />center, was mantled with outwa,sh deposits. Aterr.atic interV~,during this erosion, volcanic <br />activities broke out, with theadve.nt of flows and the injectiQnof dikes, stocks, and sills. <br />Followed again by another erosiollal phase, including several cycles of uplift and subsequent <br />erosion, the present,topo,&raphic foitns were developed. <br /> <br />Sedimentary strata to be encOuntered are: <br /> <br />1. Entrada and Morrison shalcsand sandstones <br />2. Dakota sandstones <br />3. Mancos shales <br />4, Igneollsintrusions <br /> <br />(p.2-3, Western Slope Investigation, Mancos River Project, US Bureau of Reclamation, October <br />1939) <br /> <br />3.5.2 Soils <br /> <br />The best soils in the Mancos Valley are the alluvial deposits from sandstone or shale, which are <br />red and brown in color, vary in texture from sandy to silty loam, and occur in series of small <br />river terraces. Some deposits are 20 feet in depth and rarely show alkali or seepage. The soil <br />found mainly in the river and creek bottom are alluvial deposits from shale. These are light grey <br />to grey in color, take water slowly, do not drain easily and tend to become alkaline. A <br />comparatively small portion of the project lands is covered by residual sandstone soil, sandy in <br /> <br />15 <br />