THE SHELBYVILLE MORAINIO SYSTEM. 215 



depth (75 feet), for the wells are entirely through soft till to the water- 

 bearing- gravel near the bottom. 



In the vicinity of Heyworth inflammable gas is found in sand at depths 

 ranging from 155 to 214 feet. The strongest well is located on the farm of 

 J. C. Wakefield, three-fourths of a mile southeast of the village, and has 

 the following section, reported by the driller, Mr. Gault: 



Section of Wakefield's gas teell near Heyworth, Illinois. 



Feet. 

 Till (Shelbyville sheet) 33 



Gravel and sand (probably Shelbyville) 69 



Hard clay with no pebbles or grit 3g 



Sand jg 



Hard blue clay 35 



Hard clay with no grit jj 



Black muck . 



2 



Hard gray clay without grit j3 



Sand and gravel with gas. 



Total depth 214 



When the gas was struck, sand and gravel were blown out of the 

 mouth of the well, and the well now has a pressure of 22 pounds to the 

 square inch from a 2-inch pipe, and supplied fuel for 200 stoves during 

 the winter of 1896-97. 



At Wapella, a village 6 miles south of Heyworth, the deep tubular 

 wells penetrate about 80 feet of soft blue till referable to the Shelbyville 

 drift sheet. Beneath the blue till is a bed of black muck, probably 

 Peorian, with a green clay, apparently a swamp subsoil, underlying it. 

 This is perhaps an Iowan silt, Beneath the green clay is a hard bowlder 

 clay, referred to the Illinoian. Many of the Avells are obtained at the base 

 of the Shelbyville sheet at 65 to 80 feet. Those which reach a greater 

 , depth obtain their supply from sand associated with the older till, and the 

 sand not infrequently jnelds a, considerable amount of gas. 



At Leroy, in southern McLean County, the waterworks supply is from 

 a well 110 feet deep, which obtains its Avater from sand below the till of 

 the Shelbyville sheet. Wells are occasionally sunk in that vicinity to a 

 depth of nearly 200 feet and penetrate a large amount of sand in the- lower 

 portion. 



At Farmer City the waterworks supply is from a well 176 feet in depth 

 which does not reach the rock. It is mainly through till, but there are 



