320 Bowman — Geologic Relation of the Cuzco Remains. 



mixed with material of about the same texture aud compo- 

 sition, and that they lay in a nearly horizontal plane. 



The form of the bluff at the locality in point may be appre- 

 ciated by the photograph, fig. 4, and by the profile, fig. 10, 

 based on measurements. The topographic relations and the 



Fig. 13. 



Fig. 13. Mountains on the border of the Cuzco basin. The white strata 

 of the terrace at the foot of the mountain are of Tertiary age. The alluvium 

 covered floor of the basin shows in the foreground. 



geographic position may be understood from the maps (Plates 

 I and II), which exhibit so many details that further description 

 is hardly required. 



Age of Deposits. 



In order that the antiquity of these remains may be con- 

 sidered in a concrete way, we shall now examine the deposits 

 with a view to determining their age. It may be clearly seen 

 from fig. 10 that the coarse gravels of the region are the upper- 



