WELLS OF LIVINGSTON COUNTY, ILLINOIS. 665 



moraine (Chalsworth-Cayuga Ridge) classed in the Bloomington system. 

 The northeast part of the county drains northward through Mazon Creek. 



Aside from the moraines just referred to, which traverse the central 

 portion of the county in a northwest to southeast course, and which occupy 

 a belt with an average width of about 10 miles, the surface of the county 

 is very flat. Nearly all the streams of the county flow in mere ditches 

 channeled to a level but a few feet below the plains. 



With the exception of a narrow strip along Vermilion River from near 

 Fairbury to Streator, where rock is frequently exposed, the county has a 

 heavy deposit of drift averaging possibly 150 feet in thickness. 



There appear to be buried valleys traversing the county whose rock 

 floors are 150 to 200 feet below the general level of the rock surface. In 

 such valleys the drift is over 300 feet in thickness. On the borders of Ver- 

 milion River nearly all of the thin sheet of drift is sand and gravel. 

 With this exception the county is generally covered with a thick sheet of 

 blue till, which is oxidized for a few feet at the surface. On the Marseilles 

 moraine in this county a blue till is found at less depth than at any other 

 points noted in the State, in places within 2 or 3 feet of the surface, there 

 being very little yellow or oxidized till. Usually the yellow till is 6 to 10 

 feet in depth both on this moraine and later ones. 



Nearly all the well sections obtained in this county are located in the 

 northeast one-half, the southwest part having been covered only by a hasty 

 reconnaissance. Along the Marseilles moraine and also on the plain to the 

 northeast wells are frequently sunk to a depth of 100 feet or more, and 

 better supplies appear to occur at that depth than nearer the surface. 



INDIVIDUAL WELLS. 



The public water supply at the city'of Dwight is obtained from two 

 wells sunk to a depth of 135 feet in the glacial drift. The water rises 

 within 5 feet of the surface. A boring for coal at this town entered shale 

 at about 100 feet. The record of a private well in the northeast part of the 

 town is as follows: 



Section of icell at. Dwight, Illinois. 



Feet. 



Yellow till 17 



Blue till 83 



Hard yellow till 17 



Total 117 



Sand at bottom from which water rises within 5 or 6 feet of surface. 



