Keywords: Protichnites.jpg Protichnites tracks late Cambrian central Wisconsin Joshua Gass collection On display at Weis Earth Science Museum en wikipedia CommonsHelper 2007-03-25 Kennethcgass wikipedia en Kennethcgass Original upload log page en wikipedia Protichnites jpg 2007-03-25 14 21 Kennethcgass 2272×1704× 285597 bytes <nowiki>Protichnites tracks late Cambrian central Wisconsin Joshua Gass photo</nowiki> Trace fossils Cambrian fossils from the United States Paleozoic Animalia trace fossils Extinct Arthropoda Fossils of Wisconsin Protichnites Taken with Nikon Coolpix L4 |