558 



GEOLOGY OF OHIO. 



shown to be three feet thick, and so far from the surface that it may be 

 profitably mined. The sandstope below it rests upon No. 6, and is thirty 

 feet thick. 



On the hill west of Millersburg a patch of limestone may be seen near 

 the horizon of this coal, which probably represents the bufi limestone of 

 No. 7, in the central and eastern parts of the State. The sandstone above 

 this is the highest rock found in place in the county. 



lEON QBE AND FIRE CLAYS. 



Incidental mention has been made of these minerals in the previous 

 pages of this report. The fire-clays observed are all plastic, of a thick- 

 ness ranging from four to ten feet or more, and are found under nearly 

 all the exposures of the coal. They are of good quality, and practically 

 inexhaustible. 



Very little drifting or digging, has been made anywhere to develop the 

 character of the ore deposits. Accidental exposures are numerous, and 

 in some places very large quantities are found on the slopes and in the 

 ravines. The following table of analyses of specimens taken from the 

 surface in localities giving the best promise of a large supply, will indi- 

 cate their character : 



* Water and organic matter. 



No. 1. Under Motes' coal, Knox township. 



No. 2. " " Waverly. 



No. 2. Under Coal No. 2, Hardy township. 



No. 3. " Knox " 



No. 4. Over Coal No. 3, Knox township, Simmons's. 



No. 5. " " Ellison. 



"No. 6. Iron ore seani, Washington township. 



