Keywords: JurRockgd01.jpg Cross-section of a Jurassic rockground; borings include Gastrochaenolites some with boring bivalves in place and Trypanites; Mendip Hills England; scale bar 1 cm Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html 2007-12-27 Original uploader was Wilson44691 at http //en wikipedia org en wikipedia Released into the public domain by the author en wikipedia Wilson44691 original upload log page en wikipedia JurRockgd01 jpg 2007-12-27 15 32 Wilson44691 1000×750×8 250805 bytes <nowiki>Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html</nowiki> Trace fossils Bioerosion Mendip Hills Fossils of Somerset Jurassic fossils from the United Kingdom |