336 THE ILLINOIS GLACIAL LOBE. 



satisfactory knowledge of the lower portion of the drift. The well is 

 located at Ravinia. Its section was furnished by the driller, William 

 McWendle, of Oak Glen. 



Section at Ravinia, Lake County, Illinois. 



Feet. 



1. Pebbly yellow clay 11 



2. Grayish-blue pebbly clay 60 



3. Gray clay, very pebbly 10-12 



4. Grayish-blue pebbly clay, lighter color thau No. 2 70 



5. Clay, resembling putty 4-5 



6. Limestone 22 



Total drift 164 



TILL RIDGES ON THE SOUTHEAST BORDER OF LAKE MICHIGAN. 

 THE OUTER RIDGE. 



The outer ridge is distinctly traceable only from the vicinity of Benton 

 Harbor, Michigan, to Wheeler, in Porter County, Indiana. It is closely 

 associated with the Valparaiso morainic system for a few miles north from 

 Benton Harbor, but a ridge supposed to be its continuation is found west 

 of the " Pine Plains" in Geneva Township, Van Buren County, and Casco 

 Township, Allegan County. Farther north it has not been recognized and 

 may be combined with Covert Ridge. It is separated usually from the 

 inner border of the Valparaiso system by a narrow plain averaging scarcely 

 more than 2 miles in width and nowhere exceeding 5 miles. 



From the point of connection with the Valparaiso system, east of 

 Benton Harbor, in Berrien County, Michigan, southwestward to the St. 

 Joseph River, a distance of 4 or 5 miles, there is only a vaguely defined 

 morainic belt. But immediately south of St. Joseph River, about 3 miles 

 south of Benton Harbor, a definite ridge sets in, which leads southward 

 along the east side of the Vandalia Railway to within a mile of Baroda. 

 A gap about a mile in width here occurs, through which Hickory Creek 

 finds a passage and which is also utilized by the railway. The ridge sets 

 in on the west side of the creek, in sec. 10, T. 6 S., R. 19 W., and leads in 

 a slightly winding course west of south to New Troy. At this village a 

 narrow gap occurs, through which the North Galien River has a passage. 

 From the south bluff of this stream the ridge leads southwestward past 

 Three Oaks and comes to South Galien River about a mile north of the 





