of the Cuzco Valley, Peru. 



35 



expansion in early Pleistocene time. During this period an 

 observer standing at the site of Sacsahuaman would have seen 

 before him an unbroken expanse of water stretching southward 



Fig. 24. 



%;■>. 





Fig. 24. Canyon cut in gravel. Northeast wall of Ayahuaycco quebrada. 

 Hiram Bingham, photo. 



to the Angostura Narrows and overlapping the slopes of the 

 northern and southern walls of the Cuzco Basin. On the left 

 the bays of Huancaro, Ttancarpata, Pillau, and Huanacauri 



