J. B. Hatcher — Geology of Southern Patagonia. 349 



Later Sedimentary Deposits. 



In the region visited there are other sedimentary deposits, 

 usually of very limited extent and evidently of quite recent 

 origin. My observations do not warrant any very definite 

 opinions regarding the origin or exact age of any of these 

 deposits. £mong them I may mention some of loess (?) in the 



Fig. 8. Example of wind erosion on south fork of Rio Chico, Patagonia, from 

 a photograph by the author. 



high bluffs north of the Grallegos River, just west of Killik 

 Aike. They rest unconformably upon the Santa Cruz beds, 

 are about 40 feet thick and are composed of very fine sand 



