CLASTIC MATERIALS 51 



low, gently and smoothly sloping lenticular Mils composed of un- 

 assorted glacial debris, and which are common in eastern Massa- 

 chusetts and other glacial regions. The general name moraine 

 includes the heterogeneous materials brought down by glaciers 

 and ultimately deposited in undulating hills and ridges on their 

 final disappearance. (See further under The Eegolith, p. 287.) 



