670 GEOLOGY OF OHIO. 



On Section 23, Monroe township, the coal is fifty-three feet from the 

 surface, and ten feet ten inches thick. 



On Section 15, of same township, north-west quarter, the coal is 

 twenty-nine feet from the surface, and eleven feet six inches thick. 



On Section 9, north-east quarter, the stream has exposed the upper 

 portion of the coal, and at this point Sands's bank was opened, and an 

 entry driven some thirty or forty yards. 



The following is a section of the strata : i 



FT. IX, 



Sand-rock. 



Shale 6i .. 



Coal 2 11 



Shale 1 



Coal 5 3 



Shale 2 



Coal 2 10 



Total thickness of coal 11 3 



These sections will suffice to show the general character of the coal, 

 and to indicate its continuity over all this field. A marked change will 

 be observed in the relative ^thickness of the difiierent benches. At 

 Shawnee and Straitsville, the lower benches furnish the purest coal, and 

 are about two feet thick each. Here the lowest bench is often three feet, 

 and the middle bench between five and six feet, and neither of them in 

 any respect inferior to the corresponding benches at Shawnee or Straits- 

 ville. Indeed, a careful study of all the exposure shows that here is the 

 maximum development of the coal, both in thickness and in quantity, 

 only one improvement being to the north of this, viz., a smaller per- 

 centage of water in the coal. 



The coal is here dry, being free from sulphur, susceptible of being 

 mined in large blocks, is more laminated, showing thin seams of mineral 

 charcoal, which make it more open burning and an excellent furnace 

 coal. 



