212 GEOLOGY. 



relations can rarely be seen because of the destruction of the older 

 terraces, and because of the erosion by waves along shore. 



The topography of terraces is similar to that of flood-plains, except 

 in so far as modified by erosion. While flat in general, the terrace 

 may slope either toward or from the valley bluff, and its surface may 

 be marked by all the minor irregularities which characterize a flood- 

 plain. 



