17 o 



PHYSICAL GEOLOGY 



At its greatest extent (Fig. 565, p. 646) the ice may have stretched 

 on the east as a great wall from Massachusetts to northern Labrador, 

 discharging icebergs throughout its length. The terminal moraine 

 forms the backbone of Long Island and stretches across northern 



Moraines of the Wisconsin 

 Ice Sheet and the limit of 

 maximum glaciation 



FlG. 160. — Map showing moraines and direction of ice movement (indicated by 

 arrows; of the last continental ice sheet. The lobate character of the moraines is pro- 

 nounced. The "driftless area" was not covered by ice. (After U. S. Geol. Surv.) 



New Jersey. From there its direction is northwest to the state of 

 New York and from there to the southwest as far as northern Ken- 

 tucky and almost to the southern tip of Illinois. From Kansas it 

 rids a little west of north into North Dakota, from which point it 

 lias a general east and west direction except in the mountainous regions. 



