142 Eaton — Yertebrate Fossils from Ayusbamba, Peru. 



was found. This indicates clearly that, in most cases, the 

 bones of animals, perishing near the borders of this ancient 

 lake, were widely scattered before being finally covered by 

 alluvium from the neighboring heights. It is possible that 



Fig. 1. 



Fig. 1. View N. 5° E. over Ayusbainba fossil beds from the southern 

 margin of the basin. 



some" of this vertebrate material may have been originally 

 embedded at a slightly higher level. I see no reason, however, 

 to question the contemporaneity of the extinct species of animals 

 represented in this collection. No vertebrate fossils had been 

 previously described from this part of the Peruvian Andes. 

 Therefore every recognizable specimen, that might add to our 



