Keywords: Echinosphaerites (1).JPG File Echinosphaerites JPG better image with included scale bar Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www wooster edu/geology/MWilson html This is an older image without a scale; replaced by Echinosphaerites JPG en wikipedia Hystrix CommonsHelper 2007-10-21 Wilson44691 wikipedia en thumb left with scale bar Wilson44691 original upload log page en wikipedia Echinosphaerites JPG 2007-10-21 18 16 Wilson44691 1648×1548× 475170 bytes <nowiki>Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www wooster edu/geology/MWilson html</nowiki> Round animals Echinosphaerites Cystoidea fossils |