668 



THE ILLINOIS GLACIAL LOBE. 



Wells in Livingston County — Continued. 



MARSHALL COUNTY. 



GENERAL STATEMENT. 



Marshall County is situated on the borders of the Illinois River south 

 of Bureau and Putnam counties. It has an area of 400 square miles, and 

 Lacon is the county seat. About two-thirds of the county is situated east 

 of the Illinois River and is mainly a plain standing about 300 feet above 

 the river. Sandy Creek and Crow Creek lead westward entirely across 

 this portion of the county, the former draining the north and the latter the 

 south border. The portion west of the Illinois rises on the western border 

 to an elevation fully 400 feet above the Illinois River, or about 850 feet 

 above tide, there being - a prominent morainic belt (the outer moraine of the 

 Wisconsin series) traversing the western edge of the county from north to 

 south. 



The broad valley of the Illinois River, averaging about 5 miles in width, 

 is filled to a depth of about 150 feet with gravel and sand. The well at 

 Henry, on one of the terraces (not the highest), reached rock at 135 feet, 

 and wells above this village in Putnam County strike rock at correspond- 

 ingly low level The western portion of the county has a thin sheet of 

 drift on the borders of the Illinois Valley, but there is a heavy deposit along 

 the moraine. The eastern portion of the county is apparently heavily cov- 

 ered throughout, there being only occasional slight exposures of rock in the 



