602 THE ILLINOIS GLACIAL LOBE. 



above tide. At Deerfield post-office an old soil was found beneath the blue 

 till at a depth of 35 or 40 feet. As this stands outside the Wisconsin drift 

 sheet, the soil is to be referred to an earlier interglacial stage than that 

 immediately preceding the Wisconsin stage of glaciation, probably the 

 Sangamon stage. A well on the moraine in sec. 27, about 75 feet higher 

 than Deerfield, enters a black soil at a depth of 125 to 130 feet, or at 

 nearly the same level as that at Deerfield, and perhaps to be referred also 

 to the Sangamon interglacial stage. The following records of deep wells 

 were obtained along the moraine in the southeast part of this township: 



Wells in T. 41, R. 3 E. 



Feet. 



Mr. Casey, sec. 13, altitude 875 feet 130 



John Lloyd, sec. 27, altitude <J00 feet 130 



Sergis Lloyd, see. 34, altitude 900 feet 190 



James Gibson, sec. 23, altitude 850 feet 90 



James Renwick, sec. 28, altitude 900 feet, enters rock at 230 feet 230 



In T. 40, R. 3 E., a well in sec. 3, 183 feet in depth, enters rock at 

 176 feet. The altitude of the well mouth is about 900 feet. A well in 

 sec. 20, 109 feet in depth, is reported to have passed through a black soil 

 near the bottom. The altitude is about 875 feet. A well a mile east from 

 this reached a depth of 123 feet. 



In T. 40, R. 4 E., records of several wells which reach rock were 

 obtained. One at Mr. Barlow's, in sec. 31, 153 feet in depth, enters rock at 

 140 feet. One at Mr. Ghirler's, in sec. 32, also enters rock at about 140 

 feet. The altitude at these wells is 860 to 875 feet. A well at William 

 Barr's, in sec. 31, at similar altitude, failed to reach rock at 183 feet. At 

 Dekalb one of the artesian wells reaches rock at 126 feet, another at 195 

 feet, and another at 309 feet. South of Dekalb, in sec. 33, a well enters 

 rock at 225 feet. The altitude of these wells in the vicinity of Dekalb is 

 between 865 and 900 feet. Records were obtained of seven wells between 

 Dekalb and Malta having a depth of about 100 feet each, and one well 

 having a depth of 150 feet, none of which enter rock. 



The city water supply of Dekalb is obtained from a well 890 feet in 

 depth, which terminates in the St. Peter sandstone. Several other deep 

 wells have been made in the city which terminate in that sandstone. A 

 well at the public square was drilled to a depth of 2,470 feet and terminated 

 in the Potsdam sandstone. Mr. Elwood sunk a well near Dekalb to a 

 depth of 700 feet. None of the wells mentioned overflow. The well at 



