2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8o 



Canyon, tracks can be found in the Coconino, Hermit, and Supai 

 formations wherever local conditions permit of search being made 

 for them. 



In the Coconino, footprints were found in debris at the base of the 

 Coconino cliff on the west side of the Bright Angel Trail, and were 

 also noticed by Dr. E. F. Miller of the Marlin Oil Company, on the 

 Grand View Trail where he was engaged in measuring the geological 

 section. Their presence here is further substantiated by a specimen 

 (No. 2367, U. S. N, M.) collected in this same locality in 1903 by the 

 late Dr. Charles D. Walcott. This is some 20 miles east of the nearest 

 known fossil footprint locality, and thus considerably extends their 

 previously recorded range. 



Accompanied by Dr. David White and Mr. G. E. Sturdevant, 

 I visited the Dripping Springs locality at the head of Hermit Gorge 

 and, although only a short time was spent there, we observed tracks 

 in great abundance on the sloping ledges immediately to the north and 

 east of the spring, thus fully verifying earlier reports of their 

 occurrence. 



Considerable time was .spent in searching the track-bearing horizon 

 in the Coconino formation where it is crossed by the Yaki Trail, and 

 although numerous tracks and trails were found, with one exce]ition 

 their preservation was so poor that none was thought to be of suf- 

 ficient value to collect. 



In the Hermit formation. Dr. David White discovered tracks of 

 extinct animals in association with fossil plants in two distinct and 

 widely separated localities — on the Bright Angel Trail and on the 

 Yaki Trail. In both of these localities the preservation of the plants 

 was far superior to that of plants found in Hermit Basin, but the ani- 

 mal tracks were inferior in that only a few imprints were found, 

 never a trackway of any extent. Neither of these places, therefore, 

 seems to be a promising locality for further work, their chief interest 

 being in extending the known geographical distribution of the Hermit 

 ichnites. 



In the Supai formation Mr. Sturdevant, as previously mentioned, 

 found a slab of well preserved tracks on the Bright Angel Trail, and 

 numerous footprints were observed by us on blocks that had fallen 

 down from the more or less perpendicular face of the track-bearing 

 bed of sandstone on the point which projects into the Canyon immedi- 

 ately below Yavapai Point. 



Several days prospecting in the Supai formation along the western 

 side of O'Neill Butte on the Yaki Trail disclosed a considerable abun- 



