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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br /> <br /> <br />GEOLOGY <br />General Geology <br />The Gunnison Ready Mix pit is located within the Tomichi Creek <br />and Gunnison River ancient floodplain and deposition regime. <br />The material is basically a well sorted, poorly graded cobble <br />and small boulder, peri-glacial deposit. Some small zones of <br />gravel, sands and silts exist in an erratic fashion throughout <br />the deposit, but none have been observed in the existing pit <br />area. <br />The source of this aggregate is primarily from the Upper Tomichi <br />Creek/Quartz Creek and the Cochetopa Creek Drainages. <br />Examination of the aggregate from the Gunnison Ready Mix <br />pit indicates that 4 basic rock types compose the majority of <br />the cobbles and boulders. The deposit is predominantly dark <br />colored Pre Cambrian age Metamorphic rocks with origins <br />from the lower Cochetopa Creek and the Sargents/Marsha.ll Pass. <br />Area. Lighter colored fragments are hard volcanic rocks of the <br />Los Pinos Formation and the San Juan Mtn. group South and East <br />of the Gunnison Ready Mix pit and fine grain, intrusive, granitic . . <br />rocks of the Saguache Mountain Range. <br />The fine grain fraction of the deposit are silts and sands partially <br />derived from The Dakota Sandstone, Morrison and Junction Creek <br />Pnn< I~ of hh <br />