NO. 9 



GRAND CANYON FOSSIL FOOTPRINTS GILMORE 



J9 



Geological occurrence. — Coconino sandstone (150 feet above base), 

 Permian. 



Description. — Stride about 123 mm. ; width of trackway about 144 

 mm. Hindfoot: Length 44 mm.; width 51 mm. Sole subtriangular, 

 deeply impressed in type. There were five distinct subequal toes ; 

 digits short, with broadly rounded terminations without trace of 

 claws, though there may have been a bluntly rounded nail. Fifth 

 digit slightly divergent. Forefoot: Length about 28 mm. ; width 

 about 47 mm. Sole suboval, inside and front most deeply impressed. 

 Five distinct radially arranged toes, and, as in the pes, short with 



Fjg. II. — Baropczia cakiiii. Outline of footprints showing width 

 of trackway and relative positions. Type, No. 11,137, U. S. N. M. 

 A, Left forefoot; B, left hindfoot; C, right hindfoot showing 

 deformed fourth and fifth digits. About 2 natural size. 



bluntly rounded extremities, first much reduced, others apparently 

 subequal in size ;• fourth and fifth divergent. 



This species has the print of five toes on the hindfoot and appar- 

 ently five on the fore. The tracks made by the hindfoot of the 

 right side diiTer so from those of the left (compare fig. 11 and 

 pi. 8) as to clearly indicate that the right has sufifered injury causing 

 -two toes, the fourth and fifth, to protrude prominently outward from 

 the side of the foot. This same peculiarity, though less distinctly in- 

 dicated, is noted in the paratype (pi. 9) which leads to the conclusion 

 that both series of tracks were made by the same individual. The 

 paratype, a beautifully preserved trackw^ay, is a striking example of 

 the unreliabilitv of the information to be obtained from fossil foot- 



