644 THE ILLINOIS GLACIAL LOBE. 



well, however, in sec. 11, was sunk to a depth of 196 feet and entered rock 

 at about 150 feet. Mr. Otis Latham made a well in Piano which struck an 

 old soil containing grass leaves beneath till at a depth of about 25 feet. 

 Southwest of Piano, in sees. 29 and 31, two wells 44 and 69 feet in depth 

 are mainly through sand, and do not enter rock. 



At Oswego there is a very thin coating of gravelly drift on the rock, 

 and wells are usually sunk into the limestone about to the level of Fox 

 River, 30 or 40 feet. The public water supply is from drilled wells. 1 For 

 about 5 miles below Oswego there is a gravel plain on the east side of 

 Fox River a mile or more in width, on which wells are obtained at depths 

 of 10 to 30 feet without entering rock. 



At Yorkville the public Avater supply is obtained from springs in the 

 Marseilles moraine which borders the town on the southeast. The private 

 wells are obtained at depths of 15 to 30 feet and seldom enter the rock. 



At Millington flowing wells may be obtained from the St. Peter sand- 

 stone at slight depth. Two at the residence of Dr. J. A. Freeman, 78 feet 

 in depth, enter this sandstone 27 feet. The drift, with the exception of 

 about 20 feet of gravel at surface, is mainly till. The wells are ordinarily 

 obtained in this village at depths of 12 to 20 feet in the gravel of the Fox 

 River Valley. 



In the vicinity of the village of Plattville on the plain east of the 

 Marseilles moraine many flowing wells have been obtained. The majority 

 have a depth of but 30 to 45 feet, but occasionally a depth of 70 feet or 

 more is reached. The water is obtained in sand below till and the absorb- 

 ing area is, in all probability, in the Marseilles moraine on the west. A 

 deep well 2 miles north of Plattville at an altitude about 50 feet above the 

 village, or 650 feet above tide, reached a depth of 550 feet and entered St. 

 Peter sandstone at 511 feet. A large amount of water is obtained, but it 

 does not overflow. Rock was entered at 143 feet and is mainly limestone 

 down to the St. Peter sandstone. A well 1£ miles east of Plattville at 

 about the same elevation (600 feet) entered rock at 40 feet and was drilled 

 to a depth of 80 feet. 



In the vicinity of Lisbon, where the altitude is 625 to 640 feet, limestone 

 is entered at a depth of 10 feet or less, and wells are obtained at depths of 

 only 30 to 50 feet. For 4 or 5 miles northeast of Lisbon rock is usually 



1 Manual of American Waterworks, 1897. 



