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1 <br />1 <br />1 <br />1 <br />1 <br />~ ~ <br />EXHIBIT D <br />Geology <br />Cedarwood Clay Mine is located in horizontally bedded Dakota <br />sandstone of lower Cretaceous age. The commodity of interest is a <br />6 to 10 foot thick seam of dark gray, carbonaceous clay underlying a <br />10 to 12 foot thick sandstone unit which is overlain by about a 5 <br />foot thickness of residual soil. <br />