THE WORK OF SNOW AND ICE 



303 



chiefly of the drift accumulated beneath the lateral margins of the 

 glaciers. This accumulation is the result of the lateral motion of the 



Fig. 279. — Glacial drift, coarse and fine together. (Geol. Surv. of N. J.) 



ice from center to side. Such sublateral accumulations are akin to 

 terminal moraines. Some of the lateral moraines of ancient valley 

 glaciers, such as those of the Uinta, Wasatch, and Bighorn mountains 

 are several hundred feet high, and in one case about 1000 feet. In 

 northern Italy lateral moraines are said to be 1500 to 2000 feet high.* 

 Most of the material which was englacial during the transportation 

 becomes either subglacial or superglacial before deposition, for it ordi- 

 narily reaches the bottom or the top of the ice before being deposited. 

 Where the ends or edges of a glacier are vertical or nearly so, as in the 

 high arctic regions, deposition may take place from the englacial position 

 directly. 



1 Geikie, The Great Ice Age, 3d ed., p. 529. 



