SUPPLEMENTAL REPORT—HANGING ROCK DISTRICT. 913 
River. There are sometimes two in the series, though more frequently but 
one. It hasz the name of Coal No. III in Dr. Newhberry’s classification. 
Ag it is followed through the State, it acquires various local names de- 
rived from points where it-is worked. At Flint Ridge, in Licking 
county, it is the best cannel coal of the State, and it is accordingly quite 
widely known in this region as the Flint Ridge Cannel. In the Hocking 
Valley it no where attains importance, though its presence is almost 
always to be recognized. Near Logan it was mined some years ago for 
the manufacture of coal oil for distillation. The seam is here a cannel, 
but of poor quality. In Vinton county it furnishes far more coal than 
in any other division of the Hanging Rock District. Two seams, under- 
lying or representing the two divisions of the limestone, are found here 
from fifteen to twenty-two feet apart, each of which attains a fair thick- 
ness, though the quality of the coal is no where such as to warrant its 
use for anything more than local supplies. It is called the Dowd seam at 
Zaleski. In the vicinity of Hamden Junction the seams have been 
worked to a small extent as the Ely Coal and Wilbur Coal. | 
South of Vinton county the place of the seam is generally kept by a 
bed of black slate or impure coal; but it is not known to furnish any 
fuel throughout this region. Whenat its best the seam exhibits frequent 
changes of quality. There is always more or less cannel coal in any 
_ large development of it, and it is rare to find a workable thickness of the 
seam that does not contain a large proportion of worthless bene coal. 
The coal of this horizon, then, makes a comparatively unimportant 
addition to the supply of the Hanging Rock District. It is not known 
to be brought into the market at the present time by any line of railroad. | 
All the attempts to establish a coal business upon this seam in the dis- 
trict have so far failed, the product being uneb’e to maintain itself in 
competition with the excellent seams that aie found below it, as well as 
above it, in the geological scale. 
Coal No. III is often underlain by heavy and oe. valuable beds of 
fire-clay and potter’s clay. 
4. The seam next to be named, Coal No. IIIa, is deserving of a full 
number, certainly in Southern Ohio. It isasteadier and more important 
seam throughout this field than Coal No. III]. Though itis no where 
worked for the general market, it supplies a considerable amount of fuel, 
locally. It is separated by an interval of thirty to forty feet from Coal 
No. ILI, being associated with the Gore Limestone, one of the accessory 
seams of the general section. It bears the same relation to this lime- 
stone that the seam below it does to the Zoar, each being roofed with the 
limestone. It is to be remarked that a thin coal is frequently found di- 
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