248 THE ILLINOIS GLACIAL LOBE. 



altitude of the ridge just discussed is about as great as that of the outer 

 belt, and it constitutes the source of several of the streams which lead 

 through the outer belt, viz, Owen's Creek, Killbuck Creek, Kite River, aucl 

 "Willow Creek. 



By returning again to western Kane County, to Elburn, where the 

 inner member leaves the composite belt, and tracing the moraine westward, 

 it is found to take a more direct course than the outer one. It leads nearly 

 due west for about 10 miles, being throughout much of the distance between 

 Elburn and Cortland in view from the Chicago and Northwestern Railway. 

 Immediately south of Cortland it changes to a southwestward trend and 

 joins the outer belt for a few miles in southwestern Shabbona Township, 

 Dekalb County, and eastern Wyoming Township, Lee County, at the 

 southwestern limits of the section of the morainic system under discussion. 

 Throughout much of this distance it has a well-defined crest and occupies 

 a width of 1 to 2 miles. For a few miles at the curving portion southwest 

 of Cortland it presents two ridges separated by a sag or plane tract about 

 a mile in width that stands 20 to 30 feet below the level of the crests of 

 the ridges. In western Kane County several sharp gravel knolls 30 to 40 

 feet in height are found in this belt, and occasionally sharp knolls are found 

 in it farther west. As a rule, however, its undulations are g-entle. The 

 crest stands only 20 to 40 feet above the district to the north, but there is 

 a descent of nearly 100 feet within a couple of miles on the south border. 

 On the slope there are low knolls and a gently undulating surface. At its 

 junction with the outer border belt in Shabbona and Wyoming- townships 

 numerous basins ■ and sharp knolls occur. The knolls are in some cases 

 30 or 40 feet in height, though usually 20 feet or less. This inner moraine 

 forms the divide between South Kishwaukee River and several tributaries 

 of Fox River, and is not crossed by any stream east of its junction with 

 the outer belt. Near the point of junction south of Shabbona it is crossed 

 by Indian Creek, a tributary of Fox River, which heads in the combined 

 belt and flows southwestward. In its course through this moraine the creek 

 winds about greatly among the knolls and has not so broad a passage as is 

 afforded the streams which lead northward across the outer belt. 



In the Bureau Creek drainage basin. The SeCOlld Section of tile BloOmingtOn 



morainic svstem, which embraces the drainage basin of Bureau Creek, 

 maintains a belt on its outer border fully as prominent as that of the 



