n8 



WORK OF RUNNING WATER 



ALLUVIAL TERRACES 



Stream terraces : are bench-like flats or narrow plains along the 

 sides of valleys (Fig. 124) and above their bottoms. Most of 

 them are narrow, but some of them have great length. 



of ^ 

 CALIFORNIA 



Fig. 123. Relief-map of an area about the head of the Gulf of California, show- 

 ing the delta of the Colorado River, outlined, in a general way, by dotted lines. 

 The Salton Sink is shown at the north, and the Imperial Valley lies south of the 

 sink. (U. S. Rec. Serv.) 



1 For discussions of terraces see Gilbert's Henry Mountains, p. 126; Davis, 

 Bull, of the Mus. of Comp. Zool. Geol. Series, Vol. V, pp. 282-346; and Dodge, 

 Proc. Boston Soc. of Nat. Hist., Vol. XXVI, pp. 257-273. 



