ECONOMICAL GEOLOGY. 27 



twelve inches respectively. This boring was made with an ordi- 

 nary drill, and on sinking a shaft it was found that the six foot 

 seam of coal reported in the boring, proved to be mainly a 

 bituminous shale. 



If the Diamond drill had been used the expense of sinking a 

 shaft might have been avoided. The following record of this 

 boring was furnished and sworn to by Mr. E. Bobbins, the con- 

 tractor in charge of the work : 



Ft. in. 



10 



At Urbana and Champaign, borings have been made for coal 

 and favorable results reported, but all attemps to cany a shaft 

 down through the water-bearing sand and gravel beds of the 

 drift, have hitherto been unsuccessful. 



The following beds of drift were encountered in attempting to 

 sink a coal shaft at Champaign, the details of which were pub- 

 lished in the report of Prof. Frank H. Bradley on the geology 

 of this county in Vol. IV. page 272 of these reports. 



Feet. 



1. Soil, clay and quicksand 17 



2. Red and blue clay 73 



3. Peaty soil 



4. Quicksand 9 



5. Soft yellow clay 9 



6. Sand 



7. YeUow clay ? 



8. Quicksand and gravel 59 



Total ~~ 



