THE CHAMPAIGN MOEAINIG SYSTEM. 235 



accessible, is said to have reached a blue shale at 168 feet. This sup- 

 posed shale may, however, prove to be hard blue till. 



A boring- made in Urbana in 1884, about a half mile east of the 

 roundhouse of the Cleveland, Cincinnati, Chicago and St. Louis Railway, 

 has the following section, as reported by Prof. C. W. Rolfe: 



Section of boring at Urbana, Illinois. 



Feet. 

 Soil ! 



Yellow clay containing few pebbles jo 



Blue clay containing few pebbles 13 



Very stony clay 32 



Coarse sand and gravel 14 



Black soil 9 



Water-bearing yellow sand jg 



Blue clay 1 



Quicksand 4, 



Blue clay , " 



Quicksand 3 



Blue bowlder clay jg 



Quicksand 0= 



Blue bo wider clay w 



Sand and gravel -,- 



Quicksand ™ 



Gravelly sand '■. a 



Total drift <«.- 



The altitude of the well mouths, both in the Champaign and in the 

 Urbana borings, is about 750 feet above tide. Within 1^ miles east of the 

 court-house in Urbana, at a level but a little lower than the well just 

 recorded, rock is struck within 100 feet of the surface. On a line eastward 

 from that point to the Wabash Valley, in Indiana, the drift seldom exceeds 

 100 feet in thickness. 



A well at Thomas Goody's, in Philo, on the crest of the moraine, 

 attained a depth of 171 feet without reaching rock, and penetrated the 

 following drift beds: 



Section of well at Philo, Illinois. 



Pebbly clay changing from brown to blue 9 q 



Pebbly blue clay Z. 



Pebbly blue clay, interbedded with dry sand in thin beds 30-35 



Sandy clay called hardpan . 



Fine yellow sand, water bearing og 



Total ~1 



A well on the moraine 2 miles south of Philo, in process of boring at 

 the time of my visit, penetrated 110 feet of till, mainly of blue color, and 



