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1 <br /> <br />EXHIBIT D <br />Geology <br />Siloam Mine <br />t The Siloam Pit is located within the lower Cretaceous Dakota sandstone, <br />an interbedded beach sand and mud deposit laid down in a tropical swamp envir- <br />' onment by an encroaching epicontinenta] sea. Carbon residues from plant <br />decomposition give the clay strata their dark color. At Siloam, the clay <br />seam is 11 to 14 feet thick and the sandstone overburden is 8.5 to 13 feet <br />' thick. About 7 feet of lower Cretaceous IJiobrara marine shale, the first <br />deposit of the epicontinental sea, overlies the Dakota sandstone. All <br />1 strata are essentially horizontal. <br />1 <br /> <br />LJ <br /> <br />1 <br /> <br />1 <br />1 <br />1 <br /> <br /> <br />