Keywords: Helminthopsis01.JPG Helminthopsis ichnosp ; a trace fossil from the Logan Formation Lower Carboniferous of Wooster Ohio Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html 2007-10-21 Wilson44691 wikipedia en Wilson44691 original upload log page en wikipedia Helminthopsis01 JPG 2007-10-21 18 17 Wilson44691 2272×1704×8 1421694 bytes <nowiki>Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html</nowiki> Carboniferous life Trace fossils |