Keywords: RusophycusOrdovician.jpg en Rusophycus trace fossil from the Ordovician of southern Ohio Scale bar is 10 mm Own Wilson44691 2008-08-19 Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html Trace fossils Ordovician fossils Cincinnatian Rusophycus |