WELLS OF MASON COUNTY, ILLINOIS. 689 



INDIVIDUAL WELLS. 



At Mason the wells often reach a depth of 130 feet, though some 

 water can be obtained at 35 feet. A prospect boring- for coal at this town 

 penetrated the following- complex series of drift deposits : 



Section of drift beds in a coal boring at Mason, Illinois. 



Ft, In. 



Black soil 5 



Yellow clay .' 30 



Yellow sand 5 



Gray sand _ 32 7 



Blue clay 1 



Fine sand 22 11 



Hardpan 15 6 



Bine clay 7 



Sand : 11 



Sand and gravel 20 



Coarse sand 10 



Sand and gravel 33 



Fine red sand 1 



Dark sand 1 8 



Gravel and bowlders 5 4 



Sand 3 8 



Total dri ft 204 



Several beds of coal were passed through in the underlying Coal Meas- 

 ures, the thickest being 34 inches, struck at a depth of 290 to 293 feet. 

 The rock floor at this well is 394 feet above tide, the well mouth being 

 598 feet. 



The public water supply at the city of Havana is reported by the 

 Manual of American Waterworks to be obtained from 10 driven wells,. 72 

 feet in depth and 6 inches in diameter. 



Near San Jose, in the northeast part of the county, wells on the swampy 

 land are obtained at about 30 feet. They penetrate 6 feet or more of black 

 muck, beneath which they are in a fine blue sand to near the bottom, where 

 gravel is struck. On the higher ground east from San Jose wells are fre- 

 quently sunk to a depth of 100 feet or more, largely through sand and 

 gravel. 



TAZEWELL COUNTY. 

 GENERAL STATEMENT. 



Tazewell County is situated northeast of Mason, on the east side of the 

 Illinois River, and has an area of 650 square miles, with Pekin as the 

 county seat. The county is traversed nearly centrally from east to west by 



MON XXXVIII H 



