DRIFT DEPOSITS OF ILLINOIS. 17 



it is usually found, and the other at the bottom o! the drift, 

 and directly above the bed rock. Nothing is said in the record 

 in regard to the size or number of the boulders contained in 

 either bed, but, if we may form any conclusion from the char- 

 acter of the fundamental bed of the drift deposits at all the 

 other localities given, we should be led to suspect that the 

 lower bed here might be more accurately described as a bed of 

 gravelly clay, rather than a bed containing boulders of any 

 considerable size. 



The record of the coal shaft at Sidney, in Champaign county, 

 shows the following beds of drift occurring at that point: 



Feet. 



Sand and yellow clay 17 



Boulder clay 18 



Gray hard-pan 5 



Yellow hard-pan 15 



Coarse sand and gravel 5 



Hard-pan 35 



Total 95 



In a boring with the diamond drill at Tuscola, in Douglas 

 county, the following divisions of drift material were encount- 

 ered: 



Feet 



Surface soil and yellow clay 20 



Blue clay 5 



Hard-pan 6 



Blue clay 10 



Hard-pan 7 



Blue clay 9 



Brown clay 5 



Yellow clay 8 



Blue clay 6 



Blue and yellow clays 31 



Blue clay 22 



Gravelly blue clay 80 



Blue clay 13 



Sand... 6 



Total 178 



In sinking the coal shaft at Sandoval, on the O. & M. rail- 

 road, in Marion county, the following beds of drift material 

 were passed through according to their published record : 



-2 



