348 FIRST YEAR SCIENCE 



Hudson furnishes innumerable examples of submerged 

 river valleys. 



The tributary streams which enter low down on a river's 

 course, after submergence enter the sea directly in the 

 bays formed by the submerged valley. Such rivers may 

 be called dismembered rivers. Thus a coast region which 

 was formerly well dissected by streams will on submer- 



FAN FILLED VALLEY. 

 Notice how the river is forced to wander around the edges of the fans. 



gence become penetrated by a great number of irregular 

 channels and bays. 



Delaware and Chesapeake bays, where the early settlers 

 each had a nice little sea inlet instead of a rough wagon 

 road as his means of communication with his neighbors, 

 are fine examples of submerged river systems. These 

 drowned river valleys enabled the early settlers to pene- 

 trate easily into the country, and determined many of the 



