ECONOMICAL (JKOLOGY. 41) 



Total depth 528 6 



No. 49 of the above record is the equivalent of No. 35 iu the 

 boring at Decatur, published in Vol. VII, page 18, and repre- 

 sents coal No. 8 of the general section. In the record of the 

 boring it is described as a six-foot seam of coal, but is really 

 a thin coal, overlaid by four or five feet of bituminous shale. 

 It ivquirt-s ,-i very close and careful inspection to distinguish 

 coal from bituminous shale in the pulverized material brought 

 to the surface in the sand pump from a boring with the com- 

 mon drill, and in the majority of the borings of that kind 



made in this State, the reported results have- proved mislead- 

 



