HOCKING VALLEY. 713 



No. 2, Shawnee limestone, by Gregory. 



No. 3, top layer Cambridge limestone, Moxahala, by Gregory. 

 No. 4, bottom layer Cambridge limestone, Moxahala, by Gregory. 

 No. 5, bottom layer Cambridge limestone, Moxahala, by Gregory. 



FIRE-CLAY. 



Fire-clays of the ordinary character of the Coal Measure clays are 

 abundant everywhere, forming the bed of the coals and of many of the 

 ores. A specimen of excellent non-plastic fire-clay, similar to that at 

 Mineral Point, Tuscarawas county, has been shown ihe, as obtained in 

 the north-east part of Ward township, below the Great Vein. I was not 

 able to find the locality. 



But a non-plastic clay of good quality is mined at Logan, and used 

 extensively in the manufacture of fire brick by the Wassail Fire Clay 

 Company, of Columbus. It is three feet thick, and is much like the 

 Mineral Point Clay. 



BUILDING STONE. 



None of the massive sandstones seem to be persistent over the whole 

 field. That above No. 6, the Mahoning, is the most so, and in places is 

 a fine quarry rock. It is often loosely cemented, and decomposes on ex- 

 posure into sand. In many places, however, it afibrds good building 

 stone. And on almost every hill-side, some where in the exposed section, 

 strong and durable building stone crops out% 



SALT. 



A large number of wells have been bored for salt in the valley of Sun- 

 day Creek and other parts of this field, and a strong brine uniformly 

 obtained at a depth of from four hundred and fifty to five hundred feet 

 below the Great Vein Coal. The construction of canals and railroads 

 compelled the abandonment of all works at a distance from these means 

 of communication. The brine is evidently on the same horizon as that 



