Keywords: BioclastsBiosparite.jpg en Bioclasts in an Ordovician limestone; T trilobite; E echinoderm Scale bar is 2 0 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 Limestone Unidentified Trilobita fossils Limestone in thin section |