256 THE ILLINOIS GLACIAL LOBE. 



feet in height. This plain sets in in southeastern Livingston County, within 

 5 or 6 miles of the extreme north end of the reentrant, and is continuous 

 through Ford, Champaign, and Vermilion counties, Illinois, and western 

 Warren County, Indiana. Its greatest width is in Vermilion County, 

 where it reaches a breadth of 7 or 8 miles, a portion of it extending- into 

 the northwest part of the area shown on the Danville sheet. Its breadth 

 in Ford and Champaign counties is 2 to 5 miles. 



The inner belt of this morainic system presents two, and in places 

 three, crests in eastern Ford County. One crest leads from the point of the 

 reentrant southward through Melvin, between two branches of the Ver- 

 milion River, to the vicinity of Henderson, where it crosses the eastern 

 branch just above its junction with the western, and leads southeastward 

 through Paxton along the north border of the river into Vermilion County. 

 Another crest appears about 3 miles south of Roberts and leads southeast- 

 ward, parallel with the crest just mentioned, crossing the extreme southwest 

 corner of Iroquois County and fading out east of Paxton. A third crest 

 leads from the extreme north end of the reentrant near Chatsworth, in Liv- 

 ingston County, in a course east of south, past Pope's Grove and Roberts, 

 into southwestern Iroquois County near Loda, beyond which it is diffi- 

 cult to trace. It is on the slope of the third ridge that the knob-and-basin 

 topography above mentioned is developed. None of the three crest ridges 

 which this inner belt presents in Ford County and adjacent districts have 

 strong expression. The outer one stands 30 to 50 feet above the plain tract 

 outside (west) of it, but is not so prominent on its inner border. The other 

 ridges rise only 20 to 30 feet above the border tracts. These crest ridges 

 each have a breadth of half a mile or more. In a few places the outer 

 crest carries knolls 20 or 30 feet in height. The outer crest is also 

 more winding than the others, and has a border indented by extensions of 

 the plain which enter it a half mile or more. 



In Vermilion and Iroquois counties, Illinois, and Benton County, Indi- 

 ana, this inner belt has a well-defined crest which forms the divide between 

 the Iroquois and Vermilion rivers and which stands 3 or 4 miles back from 

 the inner border of the moraine. This crest and the inner slope are gently 

 undulating, with swells 10 to 20 feet in height. There is a gradual north- 

 ward descent of perhaps 20 feet per mile to the inner-border plain. The 

 crest usually is similar to the inner slope, but occasionally is sharply ridged, 



