26 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. ']2 



Stone mountains, and extends northward a few miles below the town 

 of Benson. 



" Erosional exposures in this general region are quite extensive, but 

 time and funds being limited the work done on this expedition was 

 confined entirely to two promising localities of relatively small area, 

 previously located by Doctor Bryan. One of these is situated on 

 the west side of the vallev, about two or three miles due south of 



Fig. 2~ . — General view of fossil bearing exposure at Curtis Ranch locality, 

 looking across the San Pedro \'alley. Partly excavated bones of Glyptodon 

 in foreground. ( Photograph by Gidley. ) 



Benson, the other on the east side, at the head of a large ' wash ' 

 three miles east of the Curtis ranch which is situated on the state 

 road about 14 miles south-southeast of Benson and an equal distance 

 northwest of Tombstone. The latter locality occupied the greater 

 part of my time and yielded by far the greater amount of material, 

 although the number of species later collected in the Benson locality, 

 slightly exceeded those found here. 



" Among the larger, and. from the museum standpoint, more im- 

 portant specimens secured at this locality are included parts of two 

 skeletons of a new species of mastodon, and parts of three skeletons 

 of a large armored edentate, Glyptoflicriitin, which when restored 

 should make a striking exhibition piece. 



