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<br /> <br />• Immediately beneath the ore horizon are interbedded mudstone and shale <br />units which ultimately grade into the Second Rim Sandstone of the Salt <br />Wash Member. There may also be some sections grading into the shales of <br />the Summerville Formation where portions of the Morrison formation have <br />slumped. <br /> <br />i <br />D-8 <br />