THE BLOOMINGTON MORAINIC SYSTEM. 243 



near Thawville and Loda, and thence to swing eastward in a curving 

 course through eastern Ford, northern Vermilion, and southeastern Iroquois 

 counties. The inner bulky ridge of the system continues eastward to 

 Fowler, Indiana, where it terminates very abruptly a few miles west of the 

 outer ridge. 



From the reentrant angle in Ford County two weak ridges are trace- 

 able westward. The inner or Chatsworth-Cayuga Ridge leads from Chats- 

 worth north of west to Cayuga, where for a few miles it passes beneath, or 

 is nearly obscured by, the Marseilles moraine. Near Blackstone, in north- 

 ern Livingston County, a ridge which is probably its continuation emerges 

 from beneath that moraine and passes northwestward nearly parallel with 

 the Vermilion River through or near Kernan, Grand Ridge, and Farm 

 Ridge villages to the Illinois Valley at Utica. For a part of the course it 

 forms the divide between the Illinois and Vermilion rivers and may easily 

 be traced on the Ottawa and Lasalle topographic sheets. This northern" 

 part is known as Grand or Farm Ridge. North from the Illinois its course 

 is slightly east of north from Utica past Eariville, where it fades out near 

 the inner margin of the main moraine in southern Dekalb County. It is 

 well shown in the east part of the Lasalle sheet and northwest part of the 

 Ottawa sheet. The gaps in this ridge are narrow, and are discussed below 

 (p. 259). This ridge probably finds its correlative east of the Ford County 

 reentrant angle in a belt of undulating or slightly ridged drift leading east- 

 ward across central Iroquois County. The latter belt, however, scarcely 

 constitutes a definite moraine, being distinctly ridged only for a few miles 

 along the north border of Sugar Creek east from Milford. It disappears 

 beneath a moraine of late Wisconsin age near the State line south of 

 Sheldon, Illinois. 



The other ridge which leads west from the Ford County reentrant 

 angle, commonly known as Cropsey Ridge, from a village situated on it, is 

 distinctly traceable across the northern part of McLean County, where it 

 constitutes the water parting between Mackinaw and Vermilion rivers. It 

 fades out in the vicinity of Gridley, and is not definitely developed toward 

 the west or north until the Illinois Valley is passed. It seems, however, to 

 be a continuation of the belt which fades out in eastern Bureau Countv, as 

 noted above. The character of the topography in the interval between 

 these ridges is discussed below (p. 281). 



