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tdue to the distance they have been transported by the stream. <br /> The petrographic make up of the gravel itself is basically like <br /> that of the more resistant members of the Front Range. The <br /> basic rock types found are: <br /> Granodiorite <br /> Quartzite <br /> Quartz and feldspar grains from pegmatites <br /> Hornblende gneiss <br /> Ft. Hayes limestone <br /> Basalt cobbles from Valmont Dike <br /> Almost the entire mine site is ranked "F-1" , coarse aggregate <br /> relatively clean and sound, floodplain deposit. <br /> LUnderlying the sand and gravel is bedrock of Pierre Shale. <br /> The shale bedrock extends to a depth of up to a mile. <br /> i <br /> t <br /> I-16 <br />