Trace Fossils
Links
Precambrian Fossils
http://geowww.geo.tcu.edu/PCfossils.html
Possible Precambrian trace fossils collected in the Van Horn region of Texas.
Brule Fossil Trackways
http://www.ednet.ns.ca/cgi-bin/redirmu/educ/museum/mnh/backstge/collects/images/tracks.htm
Permian aged vertebrate trackway