766 THE ILLINOIS GLACIAL LOBE. 



made of the well at present. Exposures iu the ravines near Columbia show 

 a deposit of loess about 12 feet in depth, beneath which there are yellow 

 and blue clays containing- a few pebbles and an occasional bowlder as well 

 as numerous fragments of wood. The rock fragments are far less numerous 

 than in typical till. 



At Waterloo the wells range in depth from 20 to 80 feet, and nearly 

 all are from limestone. One at the mill, however, 20 feet in depth, was 

 obtained without entering rock. A well at the electric light plant is reported 

 to have entered rock at about 30 feet. The Manual of American Water- 

 works (1897) reports that an impounding reservoir has been constructed 

 with a view to obtaining a public water supply. 



In the vicinity of Burksville wells occasionally reach a depth of 30 or 

 40 feet before entering rock. They are mainly through a nearly pebbleless 

 clay, yellow at top and blue in its deeper portion. 



In the vicinity of Glasgow (Renault post-office) wells are often sunk to 

 a depth of 50 feet. The distance to rock ranges from 10 feet to fully 50 

 feet, but a large amount of the clay above the rock is apparently residuary, 

 there being very little glacial drift in this locality. The clay has the deep 

 reddish brown color characteristic of clay formed from the St. Louis lime- 

 stone. About 3 miles east of Glasgow, on a plain perhaps 75 feet lower 

 than the village, the drift consists of a clay with few pebbles and occasional 

 bowlders, similar to the deposits at Columbia noted above. The depth to 

 rock is about 20 feet. 



The following records of deep wells are from the drift ridges in the 

 eastern part of the county : 



At W. M. BartoPs, 2 miles east of Hecker post-office, a well 60 feet 

 in depth is through till in the upper half and sand in the lower. A well at 

 a schoolhouse in sec. 11, T. 3 S., R. 8 W., 60 feet in depth, was mainly 

 through till, and one at a farmhouse a half mile farther south, 75 feet in 

 depth, is also largely till, with wood at 72 feet. A well made by F. Voss, 

 in sec. 36 of this township, reached a depth of 115 feet, and is mainly 

 through sand. 



In the vicinity of Hecker, on the plain west of this ridge and about 30 

 feet lower elevation, wells enter rock at only 20 feet. They penetrate a 

 brown clay containing a few small pebbles. Water is usually obtained at 

 about 30 feet. 



