THE BLOOMINGTON MORAINIC SYSTEM. 255 



in eastern Ford and southwestern Iroquois counties. It is confined to a 

 belt about 3 miles in width, and probably half the surface is of this type. 

 The remainder is of a gentle swell-and-sag type. The expression is more 

 subdued than at the point of the reentrant angle, and knolls exceeding 30 

 feet in height are rare. The basins are seldom occupied by ponds except 

 in wet seasons. The contrast between this knob-and-basin tract and the 

 gently undulating crest line of the moraine is quite striking. 



Eastward from the Ford County reentrant to western Indiana. Tll6 SeC'tioil of tllC BIOODI- 



ington morainic system east from the reentrant angle presents a series of 

 ridges grouped in two belts. The outer belt throughout its course in 

 southern Ford and northeastern Champaign counties consists of a single 

 broad ridge with billowy surface, having oscillations of 20 to 30 feet. As a 

 rule, a well-defined crest is developed, but in places it completely disappears 

 and the belt consists entirely of knolls and winding ridges, among which 

 sags and shallow basins occur. Upon entering Vermilion County the outer 

 belt soon displays a double-crest line, and in the eastern part of the county 

 is separated into two ridges, as shown on the Danville topographic sheet, 

 between which there is a narrow plain tract a mile or more in width that 

 is drained by Stony Creek. This plain, however, is present for only a 

 few miles, the ridges as a rule, being closely associated. The surface of 

 the ridges varies from gently undulating to strongly billowy. The billows 

 are seldom greater than 30 feet in height. The moraine varies 75. or 100 

 feet in altitude in Vermilion County, but the variation is not abrupt, a 

 fluctuation of 50 or 75 feet usually occupying 2 miles or more. It rises 

 A^ery promptly on its south border, especially in the western part of the 

 county. In Warren County, Indiana, this belt, or at least its inner part, 

 curves around gradually to the northward and constitutes the divide between 

 Vermilion River and Pine Creek. It is overridden in northern Warren 

 County by a moraine of the late Wisconsin series, which has not obliterated 

 it, but has simply dotted the surface with small knolls, the majority of 

 which are less than 10 feet in height. The outer belt joins the inner in 

 northern Warren County and the combined belt passes northeastward into 

 Benton County, as indicated below. 



Between the outer and inner belts of the portion of the Bloomington 

 morainic system east of the reentrant angle is a narrow plain with very 

 smooth surface, there being scarcely a knoll or undulation so much as 10 



