THE CARBONIFEROUS SYSTEM. 161 
ANALYSES OF Coat No. 8. 
1 | 2 3 4. 5 6 U. 
nl Ue aah ale ee el 
Specific gravity......... 1.302 1.290 1.348 1.266 1.285 1.304 | 1.358 
IMoistunes Ae kiss 1.45 1.00 1.50 2.80 2.44 2.70 4.10 
Volatile combustible..| 36.85 34.20: 32.50 34.20 52.36 30.30 | 33.90 
JUNE CTA OOF pces eddoce 57.99 09.40 63.50 59.40 59.92 50.05 | 56.10 
JA\(S) OW SB CAPR ROSE Ree es 4.25 5.40 2.90 3.60 5.28 6.95 5.90 
100.00 |} 100.00 | 100.00 | 100.00 | 100.00 | 100.00 {100.00 
Sulphur 2.12 2.63 0.68 1.80 2.62 5.24 0.46 
902 002008 82 eCooeos 
Coat Seams No. 9 to No. 13. 
The coals higher than the Pittsburgh seam have, in Ohio, comparatively 
_little value. In this respect. our Upper Coal Measures exhibit a marked 
contrast with those in West Virginia, where locally the Redstone, Sewick- 
ley, and Waynesburg seams are all of great importance, and locally rival 
in value the Pittsburgh bed, magnificent as it is in its proportions. 
Prof. Stevenson, who has spent some years in the study of the Coal 
Measures of West Virgiria, thinks that the coals I have mentioned are 
represented respectively by Coals Nos. 8a (Redstone), 8b (Sewickley), 
and 1i (Waynesburg) of the section in eastern Belmont county. Of 
these, the Redstone and Sewickley have their greatest development at 
the east, thin out rapidly westward, and scarcely pass the Ohio, as, though 
recognized in the Bellaire section, they are there less than one foot in 
thickness, and have disappeared at Barnesville. The Waynesburg coal 
Prof. Stevenson finds represented by an exceedingly variable seam which 
passes through the highlands of Belmont county, and from its change- 
ableness is called locally the “jumping six-foot seam.” 
Coal No. 8c, of the Bellaire section, is what is known as the ‘‘Glencoe 
coal.” This is supposed by Prof. Stevenson to be a bed of very limited 
extent. Along the east front of Belmont county it is generally work- 
able, and attains a maximum thickness of four feet; but it thins out 
rapidly northward along the Ohio, and is scarcely known beyond the 
county line. At Barnesville, on the Central Ohio Railroad, it has en- 
tirely disappeared ; and it is also said by Prof. Stevenson to grow thin- 
ner passing eastward from Wheeling. 
Coals No.9 and No. 10 of Prof. Stevenson’s section are both thin along 
the Ohio, but are persistent, and No. 10 thickens toward the west. This 
shows that they were formed in a basin of which the deepest portion lay 
in that direction. Traced on the north and west to the limits of the 
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