SMITHSONIAN INSTITUTION 



Fig. 8. — Slab of fossil footprints from the Hermit shale, as exposed at the 

 head of Hermit Gorge, Grand Canyon National Park, Arizona. The follow- 

 ing forms have been recognized: Hy!o[^ns licniiitamis Gilmore, Parabarot'iis 

 coloradciisis (Lull) and CoUcttosaunis pentadactylus Gilmore. This slab is 

 GYi feet wide and 5 feet long. 



