308 THE ILLINOIS GLACIAL LOBE. 



these cities occupying its outer face. There is usually but a single crest, 

 and it follows nearly the county line between Kane and Dupage. The 

 width of the belt is 2 or 3 miles. The combined belt continues about 6 

 miles farther south than Aurora, along the line of Will and Kendall coun- 

 ties, leaving a strip 2 or 3 miles wide between the river and the moraine. 

 The Marseilles moraine there swings abruptly westward, coming to the 

 river bluff between Oswego and Yorkville, while the Minooka Ridge con- 

 tinues southward to the head of the Illinois River. The Marseilles moraine 

 follows nearly the southeast bluff of Fox River to the mouth of the stream, 

 its outer border being nowhere more than 4 miles and usually less than 1 

 mile from the stream. The width in Kendall County is only 2 or 3 miles, 

 but increases to 5 or 6 miles in northeastern Lasalle County, near the north 

 bluff of the Illinois River. 



At the Illinois Valley the moraine changes abruptly from a south- 

 southwest to a south-southeast course. Its south-southeast course is main- 

 tained in a belt 3 to 5 miles wide passing through southeastern Lasalle and 

 northern Livingston counties. In the latter county, as above noted, it is 

 closely associated with Farm Ridge, a weak inner ridge of the Bloomington 

 system. In the vicinity of Odell the moraine swings around eastward, and 

 near the line of Livingston and Ford counties takes a course north of east, 

 occupying in its curving portion a width of 8 or 10 miles. This course is 

 maintained across northern Ford, northwestern Iroquois, and southern Kan- 

 kakee counties, to the vicinity of Ste. Anne, where it changes to southeast. 

 From northern Ford County to this point it has a width of 3 to 5 miles. The 

 southeast course is maintained to the vicinity of the State line northeast of 

 Donovan. Here this moraine meets the Iroquois, a moraine of the coalesced 

 Erie-Saginaw lobe. Its relations to that moraine are still obscure, though 

 the courses of the two moraines seem to be nearly coincident in Newton and 

 Jasper counties, Indiana. Its width before connecting with that moraine is 

 1 to 2 miles. The combined moraine has a width of 3 to 6 miles and is 

 traceable as far as Medaryville, in Pulaski County, Indiana, beyond which 

 it seems either to die out or to be concealed beneath the "Lake Kankakee" 

 sand ridges. Possibly this combined moraine constitutes an interlobate 

 belt, but, as indicated below (pp. 318, 327), it seems more probable that 

 it is a result of two advances differing in date as well as direction. 



