758 THE ILLINOIS GLACIAL LOBE. 



greater depth than on the uplands, but no well records have been obtained 

 to demonstrate this greater thickness. 



INDIVIDUAL WELLS. 



In the vicinity of Iola, in the northwest part of the county, wells 

 obtain water at 12 to 15 feet without entering rock. They are mainlv 

 through a yellow clay. 



At Louisville rock is entered at about 27 feet, but wells frequently 

 obtain water in the lower part of the drift. An exposure on the bluff of 

 Little Wabash River in this village shows the following beds: 



Section of bluff of Little Wabash River near Louisville, Illinois. 



Feet. 



Brown silt with few pebbles 6 



Brown sandy gravel 5 



Brown leached till 4 



Gray calcareous till - 12 



Coal Measures shale 10 



Total drift - - 27 



On the uplands west and south from Louisville rock is usually entered 

 at 15 to 20 feet, though at elevations a few feet higher than the site of the 

 village. 



At Flora rock is usually struck at 15 or 20 feet and wells are obtained 

 at 30 to 50 feet. 



In the vicinity of Xenia rock is entered at about 15 feet and wells 

 obtain water at slight depth in the underlying sandstone or sandy shale. 



MARION COUNTY. 

 GENERAL STATEMENT. 



Marion County is situated west of Clay County and south of Fayette, 

 about midwav between the Wabash and Mississippi rivers. It has an area 

 of 580 square miles, with Salem as the county seat. The divide between 

 the Mississippi and Wabash rivers passes through the eastern part of the 

 county. The greater part of the count}^ drains westward through small 

 creeks into the Kaskaskia. The eastern part drains southward through 

 Skillett Fork, a tributary of Little Wabash River. The streams afford 

 imperfect drainag-e, and the sheet of white clay that covers the county 

 absorbs rainfall very slowly. The excess of rainfall is therefore disposed 

 of by evaporation. 



