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Niobrara Fort Hayes <br />Carlisle Shale <br />231' <br />~~ <br />Greenhorn ~ ' <br />Limestone °_~' ~ 400' <br />Graneros Shale <br />---- <br />Dakota Sandstone & <br />Dakota Aquifer <br />Not to Scale <br />Note: Of 400 feet of Interburden between the Mine and the Dakota Aquifer. approximately 300 feet are Aquitards <br />