BELMONT COUNTY. 263 



21. Coal No. 8c U_4 o 



22. Sandstone 18-35 



23. Coal No. 86 and shale (Sewickly) 1 6 



24. Limestone 20 



25. Coal No. 8a and shale (Redstone) 1 6 



26. Limestone 18-25 



27. Shale 12 



28. Coal No. 8 (Pittsburgh) 6-7 



29. Fire-clay 6 



30. Limestone 3 o 



31. Shale 7 o 



32. Fire-clay 7 o 



33. Limestone 4 



34. Sandstone 50 



35. Shale 10 



36. Sandstone 40 



Level of Ohio River. 



In no other portion of the First Geological District, excepting the 

 southern portion of Jefferson county, is so long a section of upper coals 

 seen, though it is by no means probable that we have reached the sum- 

 mit of the series. The rocks dip south-eastwardly, so that in the southern 

 portion of the county rocks much higher than any given in the section 

 must occur. The Upper Barren Group of Rogers, which, according to J. 

 C. White, has a thickness of nearly eight hundred and fifty feet in south- 

 western Pennsylvania, beginning with the sandstone above our Coal No. 

 11, is shown here only partially, the total thickness seen in northern 

 Belmont county being only about one hundred and sixty feet. In another 

 place* I have shown the relations of the Ohio upper coals to those of Penn- 

 sylvania and West Virginia, and the parallelism there given has recently 

 been confirmed by the exceedingly careful section made by Mr. J. C. 

 White, from the Monongahela to the Ohio at Wheeling, and published 

 in the Annals Lye. Nat. Hist. N. Y., vol. XI. The equivalence of the 

 coals thus determined is as follows : 



Ohio. Penusylvania and West Virginia. 



Coal No. 13 Top coal at Waynesburg, Pa. 



Coal No. 12 "Brownsville" of White, W. Va. and Pa. 



Coal No. 11 " Waynesburg." 



Coal No. 10 Wanting. 



Coal No. 9 Absent. 



Coal No. 8c Absent (east side of basin). 



CoalNo. 8t "Sewickly." 



Coal No. 8a "Redstone." 



Coal No. 8 "Pittsburgh." 



* Annals of the Lyceum of Natural History of New York. Vol. X, pp. 226 et seq. 



