904 | GEOLOGY OF OHIO. 
and a half feet in many seetions. There is more iron at this horizon by 
far than at any other in the region, and it cannot be doubted that the 
resources of science are adequate to the utilization of such a seam, even 
though unfriendly elements are present in it. Such ores are made ser- 
viceable elsewhere by exposure to the weather for one or two years after 
they have been sharply roasted. | 
At McCuneville, Perry county, the limestone beneath the ore is found — 
to be ferruginous enough to warrant it also to be ranked asore. Portions 
of it contain over twenty per cent. of metallic iron. 
8. At about thirty feet above the Gore Limestone and the Sand-block 
another ore horizon occurs in the Hocking Valley. The ore that is found 
here represents or replaces the Putnam Hill Limestone, or Gray Lime- 
stone of the eastern counties, in part, and possibly includes also a kidney 
seam that is found ten feet below the limestone at New Lexington. To 
this horizon belongs a ferruginous limestone found at the Moss and Mar- 
shall Furnace, and the heavy blue carbonate that is well shown at Hay- 
denville. 
The Dunkel ore of Vinton county appears to find its place just here, 
the intervals, however, varying a little from those given or implied 
above. The last named seam is, perhaps, the most important of Vinton 
eounty, the limestone or Baird ore alone being excepted. It ranges from 
one and a half to two feet in thickness, and holds a large scope of country 
to the north-east of McArthur. Many hundred tons of it have been 
worked in Vinton Furnace, where it came to be highly esteemed. It 
would seem to be a safe reliance for a furnace so located as to reach its 
area easily. Its place is about fifty feet below the limestone ore. 
9. The next regular deposit to be found in ascending the scale is the 
seam known as the “Limestone Kidney Ore” in Vinton and Jackson 
counties. Its place in Vinton is about fifteen feet below the Gray or | 
Hanging Rock Limestone which bears the limestone ore. The seam 
known by this name in Jackson is twice as far from the limestone, but 
it has the same character with the northern ore, and the workings of the 
seam are almost extensive enough to establish the connection suggested. 
The ore is of excellent quality, being esteemed by the furnaces as highly 
as the limestone ore, in connection with which it is generally worked. 
In Perry and Hocking counties, ore is found at the same place in the 
series, but has not been largely worked. At McCuneville this seam is 
found in connection with a “bastard limestone.” A heavy deposit of 
gray ore, identical in general character with the Baird ore, is found ten — 
feet below the last named seam on the land of W. B. Brooks, Hsq., at 
Nelsonville. It agrees in position approximately with the kidney vein. 
