Keywords: Hyoliths02.JPG Hyoliths from the Middle Ordovician of northern Estonia; these are internal molds own enwiki 2007-11-01 Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html Wilson44691 original upload log page en wikipedia Hyoliths02 JPG 2007-11-01 11 10 Wilson44691 2272×1704×8 519922 bytes <nowiki>Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html</nowiki> Middle Ordovician fossils Hyolitha fossils Hyolitha Ordovician fossils from Estonia Objects with black background |