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Just short of two and a half miles east of Keenan and just over two miles west of the unincorporated community of Gap Mills are road cuts where late Mississippian fossils can be collected from the Greenbrier Group. The most common fossils here are the brachiopod Inflatia inflata. Other local fossils include the blastoid Pentremites, the bryozoan Fenestella, corals, crinoids, gastropods, and trilobites.