914 GEOLOGY OF OHIO. 
rectly above the limestone. This is counted in under the number given 
above, for, though differing in age, it belongs to the same vital node. 
Coal No. IfIa seldom reaches thirty inches in thickness, and seldom 
falls below twelve incoes. In some neighborhoods it is known as the 
sixteen-inch seam. It is found of this thickness at McCuneville, at 
Baird’s Furnace, and at Haydenville; while in Vinton county it makes 
a showing of four feet, from the fact that it includes a bed of black slate 
in the middle of the coal. To the east of McArthur it is, on this account, 
known as the slate seam. For a short distance south of the Marietta 
Railroad, it is a chief dependence for local supply, especially in Madison 
township. It is there called, locally, the Kelly Coal. It is thin through 
the southern part of Vinton and the northern part of Jackson; but in 
Jefferson township, Jackson county, it again reaches a thickness of six- 
teen to twenty inches. It holds these dimensions southward through 
Scioto county. It has been worked for neighborhood use on Monroe Fur- 
nace, and also on Scioto Furnace lands. It seems probable that it 
makes the Hunnewell Cannel of Northern Kentucky. 
5. Coal No. IIIb, the next reliable seam to be reached in ascending the 
scale, lies twenty or thirty feet above the last named horizon. It is the 
. most valuable seam thus far found above the Wellston Coal, and is vastly 
more extensiveand steady thanit. 'Itisknown to have been worked for the 
general market but in one instance, viz., at Vinton Furnace. The com- 
mercial seam opened there is the one now under discussion. The seam 
at that point measures five feet, partings included. The quality is fair. 
The same seam, holding the same thickness and quality, is found in the 
tunnel of the Columbus and Gallipolis road, at Eagle Furnace. On the 
general section, the Tunnel Coal is wrongly identified as No. IIIc. For 
local supply this seam is largely depended on. It isa thirty inch seam 
in the neighborhood of Union Furnace, Hocking county, being here over- 
lain by two feet of highly bituminous shale. It holds through southern 
Hocking and northern Vinton, attaining its maximum near tho line of 
the Marietta Railroad, as already described. Southward it keeps its place 
quite steadily, though it is generally less than twenty inches in thick- 
ness. There isa greater multiplicity of coal seams through the southern 
part of Vinton county than in any other part of this district. The exact 
equivalent of Coal No. IIId in this region can not bs certainly given here 
but it is probable that the Wortman Coal, which lies about fifty feet below 
the Gray Limestone, is the seam sought for. If it is not, the thin seam 
ten feet below represents it. 
On the lands of Monroe Furnace, this seam has a fhigeness of three 
and one half feet, slate parting included. It has been worked here to 
