WELLS OF BUREAU COUNTY, ILLINOIS. 629 



only a few feet at a depth of 475 feet. The drift is mainly blue till and is 

 160 feet in depth. From the base of the drift to 415 feet there is shah; and 

 thin beds of sandstone. A bed of coal 4 feet thick was passed through at 

 about 225 feet. The well was mainly in limestone from 415 feet to 1,470 

 feet, where it is thought that St. Peter sandstone was entered. 1 



An artesian well has been sunk at Bureau Junction, in the Illinois 

 Valley, to a depth of 308 feet. A flow of water was obtained without 

 reaching the bottom of the Coal Measures. The well mouth is but 475 

 feet above tide, and as 135 feet of drift was penetrated, the rock floor has 

 an altitude only 340 feet above tide, or about the same as at Princeton. A 

 neighboring well on the farm of Mr. Miller, in sec. 30, T. 15, R. 10 E., 

 enters rock at about the same level above tide. 



The deepest reliable section of drift reported within the county is that 

 of a well at the village of Ohio, situated near the crest of the moraine in 

 the northern part of the county. This well entered rock at a depth of 412 

 feet, but as the altitude is 920 feet above tide, the rock floor is 508 feet, or 

 170 feet higher than in the Princeton well. It is probable, therefore, that 

 the well strikes the bluff of the old valley. 



At Neponset, which is situated on the upland outside the Wisconsin 

 drift sheet, in the southwest part of the county, the following complex 

 series of drift deposits was penetrated by a coal shaft: 



Section of drift beds penetrated in a coal shaft at Neponset. 



Feet. 



Loess \2 



Sand 4 



Blue clay (Iowan till ?) 10 



Peat, with wood embedded 3 



Marl of dark color 2 



Blue clay g 



Sand 3 



Tin !!.".""!"".."".".".!."".""; is 



Sand 3 



Yellow till 67 



Total drift 130 



The altitude at this shaft is about 825 feet- above tide. The position 

 of the peat and marl beds in the Pleistocene series is not yet determined, 

 nor is it known whether it is of similar age to the buried soil found within 

 the limits of the Wisconsin drift in this county. 



1 Information furnished by Mr. A. J. Fisher, of Buda. 



