WELLS OP IROQUOIS COUNTY, ILLINOIS. 659 



At Onarga a coal boring reached the first rock at about 300 feet. The 

 rock was interpreted to be Hudson River (Cincinnati) shale. 1 



In the vicinity of Crescent many flowing- wells have been obtained at 

 depths of 80 to 120 feet. There is scarcely a section in the south half of 

 T. 27, R. 13 W., or any part of T. 26, R. 13 W., in which the water does 

 not overflow or rise within 10 feet of the surface. The public water supply 

 at Crescent is from four wells of this class. 2 Many wells south of Crescent 

 pass through an old soil at depths varying in the different wells from 60 to 

 80 feet below the surface. Above the soil the till is not nearly so hard as 

 that below. 



At Watseka many flowing wells have been obtained from the drift at 

 depths of 100 to 150 feet, and the first rock is encountered at about 165 

 feet. The public water supply is from a well 150 feet in depth, which has 

 sufficient capacity to supply the city. In the higher portions of the city 

 the water falls short a few feet of reaching the surface. The mayor reports 

 that no shallow wells are in use and that few- wells are obtained at less 

 depth than 85 feet. The surface is coated to a depth of a few feet with 

 sand, beneath which there is a soft blue till extending to a depth of 85 or 

 100 feet. Beneath this a hard till with alternating sand beds is penetrated. 



Along the Iroquois Valley above Watseka in this county, and also in 

 Newton County, Indiana, flowing wells ai*e obtained from the drift at depths 

 of 70 to 120 feet. A well at the village of Iroquois, 88 feet in depth, is 

 reported to have passed through a black soil below blue till near the bottom. 



North of the Iroquois Valley, on the Iroquois moraine, in the vicinity 

 of Donovan, several deep borings have been made which enter rock at depths 

 of 125 to 170 feet and obtain their supply from limestone at 200 feet or 

 less. The water in that locality rises within about 40 feet of the surface, 

 or 635 feet above tide, which is nearly the altitude in neighboring lower 

 districts to the north and west. These deep wells in several instances 

 encounter an old soil at about 140 feet. Hard till sets in at about 100 feet- 

 No instance of the occurrence of a soil at the top of the hard till was 

 reported, though it is often present in the neighboring districts, as already 

 noted. 



South of the Iroquois River, in the vicinity of Sheldon, the drift has 

 a thickness of 100 to 120 feet and is mainly a blue till. On the moraine 



'Geol. of Illinois, Vol. IV, pp. 237-288. ■ Manual of American Waterworks, 1897. 



