Keywords: Ordovician hardground Utah.jpg A Middle Ordovician hardground from Utah with echinoderm holdfasts cemented to its upper surface Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html 2007-12-27 Wilson44691 wikipedia en Wilson44691 original upload log page en wikipedia OrdHdgd01 jpg 2007-12-27 15 33 Wilson44691 1000×750×8 399418 bytes <nowiki>Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html</nowiki> original upload log wikitable date/time username resolution size edit summary ---- 22 40 25 December 2008 User Wilson44691 <a href http //upload wikimedia org/wikipedia/commons/c/c0/OrdHdgd01 jpg ><img alt Thumbnail for version as of 22 40 25 December 2008 src http //upload wikimedia org/wikipedia/commons/thumb/c/c0/OrdHdgd01 jpg/120px-OrdHdgd01 jpg width 120 height 90 border 0 /></a></td><td>1 000×750 384 KB <nowiki> </nowiki> ---- 01 48 31 March 2008 User File Upload Bot Magnus Manske <a href http //upload wikimedia org/wikipedia/commons/archive/c/c0/20081225224049 21OrdHdgd01 jpg ><img alt Thumbnail for version as of 01 48 31 March 2008 src http //upload wikimedia org/wikipedia/commons/thumb/archive/c/c0/20081225224049 21OrdHdgd01 jpg/120px-OrdHdgd01 jpg width 120 height 90 border 0 /></a></td><td>1 000×750 390 KB <nowiki> en wikipedia Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www wooster edu/geology/MWilson html Transferred from http //en wikipedia org en wik</nowiki> Unidentified Crinoidea Limestone Middle Ordovician fossils Ordovician fossils from Utah Hardground Crinoidea anatomy |