SUPPLEMENTAL REPOET — HANGING EOCK DISTRICT. 915 " 



some extent. The seam grows thinner to the southward, but can bo 

 traced in its own place to the river. Its apsociation with the block ore 

 series helps to identify it, the ores having been quite largely worked in 

 Scioto county. 



6. About twenty feet above No. III6 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 

 counfy, 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 Gallipolis road. It 

 was so named on the authority of Dr. L. W. Baker, but a re-examination 

 of 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. III6. 



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 Railroad, it also grows unsteady. It is, however, found 

 in good development on the Reaeoner farm. Section 29, Brown township. 

 The northernmost development noted is on the McKinney hill, neatr 



