52 ECONOMICAL GEOLOGY. 



Total depth 351 4 



No. 44 is the lowest seam developed in this portion of the 

 State, and is probably identical with that of the Roodhouse 

 shaft in Greene county, and the Alton coal of Madison county. 

 It varies in thickness from two to four feet, and has a good 

 roof of hard bituminous shale which at some points cont;iins 

 beautiful fossil shells, in w T hich the calcareous matter is replaced 

 with bright yellow r pyrites of iron. The coal itself is also more 

 or less impregnated with the bi-sulphurate of iron. 



A shaft at Elkville, in Jackson county, reports nine feet of 

 coal at the depth of 110 feet below the surface. The folio wing- 

 record of this shaft was furnished by Mr. Robert Winning, mine 

 inspector of that district: 



No, Ft. In. 



10 



in 



