If you are interesred in finding more about Trace Fossils here are some great links:

 http://www.geo.arizona.edu/geo3xx/308/cha3.html
 http://www.uc.edu/geology/geologylist/dinotracks.html
 http://www.emory.edu/COLLEGE/ENVS/research/ichnology/
 http://www.museums.org.za/sam/resource/palaeo/tracefos.htm
 http://www.ldeo.columbia.edu/~polsen/nbcp/taxa.html
 http://www.gla.ac.uk/~gxha14/eggs/
 http://members.aol.com/paluxy2/ovrdino.htm
 http://www.enchantedlearning.com/subjects/dinosaurs/glossary/Tracefossils.shtml
 http://www.ucl.ac.uk/geolsci/edu/ugrads/fieldtrips/TraceFossils/tracefl.html
 http://www.amnh.org/exhibitions/fightingdinos/ex5.html#