4 
SUPPLEMENTAL REPORT—HANGING ROCK DISTricT. 915 
some extent. The seam grows thinner to the southward, but can be 
traced in its own place to the river. Its association with the block ore 
series helps to identify it, the ores having been quite largely worked in 
Scioto county. | | 
6. About twenty fect above No. IIId another seam is often found in the 
same section. Near McArthur, Vinton county, it is well developed, and 
has there a very conspicuous mark in the fact of a layer of flint being 
interposed between the two bodies of the coal. From this fact it acquires 
the local name of the Flint Vein. This coal lies very near to the horizon 
of the true No. IV, which latter seam underlies in eastern Ohio the Put- 
nam Hill or Gray Limestone. That limestone disappears in Hocking 
county, but its place is very near the seam of coal now under discussion. 
Accordingly the seam is marked No. IV, with a question. There is also 
uncertainty in regard to the southern extension of this coal. It is 
marked in the chart as the Conway Coal of Lawrence county, and this 
determination is quite probable. 
This seam is incorrectly identified in the general section as the Tunnel 
Coal, at Eagle Furnace, on the line of the Columbus and Gallipolisroad. It 
was so named on the authority of Dr. L. W. Baker, but a re-examination 
ef the section at that point made by Mr. Thomas Kelly, of Vinton Fur- 
nace, proves the Tunnel Coal to be the Vinton Furnace Coal, or No. ILIb. 
7. The next seam is the steadiest and most important of Vinton and 
Jackson counties. It is the “Limestone Coal” of this region, so named 
from the fact that it underlies at a short interval the Gray or Hanging 
Rock Limestone, that has been already described as the chief geological 
feature of the district. This seam in the counties named is as reliable 
as the limestone and holds a thickness of about four feet through a large 
district. It affords the main dependence of all those parts of this region 
where the limestone ore is worked. It has been mined for the general mar- 
ket along the line of the Portsmouth Branch of the M. & C. R. R. to some 
extent. It is always quite high in sulphur, but it is a bright, open- 
burning coal that is fitted to supply very important demands. There is 
probably twice as much coal at this horizon as at any other that has been 
thus far named. The seam has never been found pure enough to warrant 
its use in the blast furnace, and it is too open-burning to make a good 
quality of coke. Southward from Jackson county it soon disappears, not 
being found at all in the main part of the Lawrence county field. North 
of the Marietta Ruilroad, it also grows unsteady. It is, however, found 
in good development on the Reasoner farm, Section 29, Brown township. 
The northernmost development noted is on the McKinney bill, near 
