712 THE ILLINOIS GLACIAL LOBE. 



river opposite this county, but extend about 2 miles into the county near 

 the south border, above the mouth of Crooked Creek. 



The drift deposits appear to be much thinner than in the counties 

 east of the Illinois, just discussed, rock being entered in many places at 

 a depth of about 30 feet. The wells are usually obtained above the rock 

 at depths of 15 or 20 feet. 



INDIVIDUAL WELLS. 



At Rushville the present public supply is from impounded water fed 

 by springs. From 1894 to 1896 a well 2,500 feet in depth supplied the 

 waterworks. The quality of the water was found so unpleasant that its 

 use was discontinued. The distance to rock varies 50 feet or- more within 

 the limits of this town. At the creamery rock was entered at only 20 

 feet, but at the northeast corner of the public square a well reached a 

 depth of 70 feet without entering rock. A coal mine on the outskirts of 

 the town enters rock at about 40 feet. The drift is mainly sand and gravel, 

 while in the well at the public square it is mainly till. 



East from Rushville, in the vicinity of Pleasant View, wells are reported 

 to enter a blue shale at depths of 17 to 24 feet, but as some of them are 

 also thought to enter gravel below this material it is probable that the 

 material is till rather than shale. These wells enter limestone at about 60 

 feet, and this probably represents the thickness of the drift. 



In the interior of the county, northwest from Rushville, wells are found 

 to enter rock at depths of 30 to 50 feet, though occasionally a greater depth 

 is reached without encountering rock. 



BROWN COUNTY. 

 GENERAL STATEMENT. 



Brown County is situated on the west border of the Illinois River, 

 immediately south of Schuyler, and has an area of 300 square miles, with 

 Mount Sterling as the county seat. Crooked Creek forms a portion of the 

 northern border and receives the drainage of the northeast half of the 

 county. McKee's Creek crosses the southern border of the county and 

 drains its southwestern portion. In thickness and structure the drift in this 

 county is similar to that of Schuyler. The surface also is generally much 

 eroded and the drift is capped by a deposit of loess. The thickness of the 



