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<br /> <br />I ) <br />~ <br />-l <br />.-- <br /> <br />Descnptlon of Basin <br /> <br />The soils of the Colorado River Basin closely resemble the geologic formations from which they <br />were deClved. Residual sOlIs derived from shale or sandstone are generally shallow. These sOils <br />can comain appreciable soluble mineral content due (0 residual and secondary mineral formation <br />from (he parenl material. Upon weathering or irrigation. salts may accumulale on or near !he <br />surface due to evaporation or consumptive use by plants. <br /> <br />9 <br />