WELLS OP CAKROLL COUNTY, ILLINOIS. 613 



At Shannon wells near the railway station enter rock at 15 or 20 feet, 

 but on a rock ridge in the south part of the village, at an elevation proba- 

 bly 30 feet higher than the railway station, or 950 feet above tide, rock 

 is entered at 8 or 10 feet. The public water supply is reported by Manual 

 of American Waterworks (1897) to be from a drilled well. 



In the south part of the county, in the vicinity of Ideal, several wells 

 enter rock at 30 or 40 feet. The loess in that locality is about 15 feet in 

 thickness. At Argo, in Johnson Creek Valley, 125 feet of sand and gravel 

 were penetrated before striking rock. 



At Fair Haven (altitude about 875 feet) the creamery well has the 

 following section, furnished by the driller, Mr. J. Schlemming, of Chad wick: 



Section of well at Fair Haven, Carroll County, Illinois. 



Feet. 



Drift 40 



Niagara limestone and chert 60 



Mainly shale 210 



Gray limestone 15 



Total 325 



Mr. Schlemming states that the wells in the south part of Fair Haven 

 Township often obtain water in the cherty beds above the shale ; otherwise 

 they must be sunk to limestone beds beneath the shale. 



At Chadwick the public water supply is from a well 215 feet in depth, 

 which enters rock at 59 feet. The rock is entirely a gray limestone and 

 appears to be the same formation which was entered near the bottom of 

 the Fair Haven well. The drift is mainly clay, there being but little sand 

 or gravel. The head is about 40 feet below the level of Chadwick railway 

 station, or 735 feet above tide. The well has a diameter of 5| inches and 

 is estimated to furnish 400 barrels per hour. 



In the vicinity of Milledgeville the best wells are about 180 feet in 

 depth and are probably from Galena limestone. The town well has a 

 depth of only 80 feet and enters Galena limestone at 12 feet. Many wells 

 obtain weak veins of water at about 30 feet near the top of the limestone. 



