756 THE ILLINOIS GLACIAL LOBE. 



In the vicinity of Duncanville wells are obtained in sand below clay 

 at a depth of 18 or 20 feet. On the higher parts of the upland rock is 

 entered at 10 or 15 feet. In the vicinity of Flat Rock, also, the drift is but 

 10 or 1 5 feet in depth. 



In the west part of the county, in the vicinity of Oblong, wells are 

 usually obtained at about 16 feet without entering rock. 



LAWRENCE COUNTY. 

 GENERAL STATEMENT. 



Lawrence County is situated south of Crawford, on the east border of 

 the State, and has an area of 360 square miles, with Lawrenceville as the 

 county seat. The Wabash River forms the eastern border of the county 

 and Embarras River traverses it nearly centrally. Both streams have 

 broad sandy bottoms several miles in width. The lowlands connected 

 with these bottoms are poorly drained, but uplands are hilly and well 

 drained. The higher portions of the county have a capping of white clay, 

 but the lowlands and river bottoms are usually covered with sand. 



The drift on the uplands is very thin, rock usually being found within 

 10 or 15 feet of the surface. Wells are, however, obtained at moderate 

 depths, there being few which have failed to obtain water within 50 feet of 

 the surface. On the lowlands the drift is probably thick, though wells are 

 obtained without reaching the underlying rock. A well across the Wabash, 

 at Vincennes, Indiana, reached a level about 60 feet below the river before 

 entering rock. 



INDIVIDUAL AVELLS. 



At Lawrenceville the best wells are obtained from sandstone at a depth 

 of about 60 feet. Rock is entered at only 10 to 15 feet. 



In the vicinity of Sumner strong wells are obtained at about 20 feet 

 from sand and gravel below clay. 



At St. Francisville the wells average only 15 feet in depth, mainly 

 through sand. 



RICHLAND COUNTY. 

 GENERAL STATEMENT. 



Richland Countvis situated immediately west of Lawrence, with Olney 

 as the county seat, and has an area of 361 square miles. The eastern por- 

 tion of tlic county drains southward to Bonpas River and the western 



