160 GEOLOGY OF OHIO. 
In Meigs county Coal No. 8 underlies a large part of the surface, 
maintains a thickness of from four to six feet, and yields a coal which is 
highly esteemed as both a steam and mill coal. It is very largely mined 
at Pomeroy and vicinity, and many thousand tons have been annually 
shipped from this point for many years. The coal from this region is so 
well known that no description is required of it. 
In the report on Belmont county by Prof. J.. J. Stevenson a detailed 
description will be found of our upper coals, and some facts of special 
interest are there reported in regard to the Pittsburgh seam. He appar- 
ently demonstrates that while in western Belmont county it is a single 
seam, on the Ohio at Bellaire it is represented by four coals, three of 
which occupy the space between Coal No. 8 and Coal No. 9, this interval 
having been increased from fifty feet at Barnesville to one hundred and 
fifty feet on the river. By carefully tracing Coal No. 8 and its associated 
strata along their western line of outcrop to Steubenville, and thence 
down the valley of the Ohio to Bellaire, he demonstrated the continuity 
of the large coal at Bellaire with that at Salesville and Barnesville; and 
since Coal No. 10 certainly, and Coal No. 9 probably, are continuous, 
each on its proper horizon, the three coals above the Pittsburgh in the 
Bellaire section seem to have no representative in the western part of 
Belmont county, unless Coal No. 8 is the equivalent of the entire group 
below No. 9 on the Ohio. It is Prof. Stevenson’s opinion that Coals Nos. 
8a, 8b, and 8c—the three seams above the Pittsburgh in the Bellaire 
section —are offshoots from Coal No. 8, and that they all run together. 
From the facts which he reports this would seem to be an almost neces- 
sary conclusion. 
Whether they are connected with the Pittsburgh coal or are independ- 
ently intercalated seams, they afford evidence of unequal subsidence of 
neighboring portions of the coal area during the deposition of the Pitts- 
burgh coal. This has occasioned immense disparity in the intervals 
between Coals No. 8 and No. 10 at the east and west ends of Belmont 
county, and gives us fresh proof of the fallacy of the theory of the par- 
allelism of coal seams. 
ANALYSES OF Coat No. 8. 
Lagrange (average), Jefferson county. 
David Brown, Pease township, Belmont county. 
R. Crawford, a i 
J. Culderhead, Short Creek township, Harrison county. 
Allison’s bank (average of 3), Harrison county. 
Federal Creek, Athens county. 
Pomeroy coal, Pomeroy, Meigs county. 
BS OOS Gee) A 
