TYPES OF DRIFT 



631 



Where an ice- 

 sheet halted in 

 its retreat, its edge 

 remaining in a 

 constant or nearly 

 constant position 

 for a sufficiently 

 long period, a ter- 

 minal moraine 

 (called a recessional 

 moraine) was de- 

 veloped. The not 

 uncommon impres- 

 sion that a terminal 

 moraine necessarily 

 marks the terminus 

 of the drift is erro- 

 neous. The word 

 terminal refers to 

 the terminus of the 

 ice at the time 

 when it formed the 

 moraine. 



Fluvio-glacial de- 

 posits have been re- 

 ferred to in earlier Fig. 523. A group of kames near Connecticut Farms, 

 pages (p. 164). They N. J. (N. J. Geol. Surv.) 

 are made (i) at the 



edge of the ice (kames and various ill-defined accumulations of 

 gravel and sand); (2) beyond the edge of the ice (valley trains, 



I MILE. 



Fig. 524. Diagram to illustrate kame terraces. ABC represents the stratified 

 drift of the kame terraces which are underlain by ground moraine. Till also covers 

 the valley bottom. 



out wash plains, deltas and various ill-defined bodies of stratified 

 drift); and beneath the ice (eskers, etc.). 



