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| Keywords: SphenothallidHoldfastOrdovician.jpg en Sphenothallus holdfast on a hiatus concretion from the Kope Formation Upper Ordovician Gunpowder Creek Kentucky own Wilson44691 2011-01-03 Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html Ordovician Animalia Animalia fossils | ||||
