\8t4.3 



289 



[BteVe'n'so'n^ 



nearer approximation locally to parallelism, while at the same time, the 

 parallelism is apparent rather than real, as the beds converge on each 

 side of the trough. So gradual is this convergence, however, that for 

 all practical purposes most of the beds might be regaixied as parallel for 

 short distances. 



If we ascend the Ceni ral Ohio Railroad from the river to the summit, 

 twenty-two miles west, or better yet, ascend Wheeling Hill, on the Na- 

 tional Roid, four miles from the river, we count nine well-marked beds 

 of coal, beginning with VIII. If we descend westwardly from the rail- 

 road summit or from the National Road on the west side of the Wheel- 

 ing Creek divide, we find only six beds t-o and including VIII, the top- 

 most bed in each case being XIII. Let us compare the two sections. 



1. Sandstone, &c 



2. XIII 



3. f^hale and Sandstone 



4. xir 



5. Sandstone 



6. XI 



7. Sandstone, etc 



8. X 



9. Sandstone 



10. IX 



11. Liinestone and Calc. Shale 



12. VIlIc 



13. Sandstone > . . . 



14. VII16 



15. Limestone 



16. VIITa 



17. Limestone 



18. Shale 



19. VIII 



20. Clay and Limestone 



21. Sandstone and Limestone. 



22. Shales, etc 



23. Crinoidal Limestone 



The first section is that obtained on the railroad east from the summit. 

 The second, to No. 21 inclusive, was obtained by desoending from the 

 summit across the National Road to Stillwater Creek. Nos. 22 and 23 

 were obtained on the railroad. This section differs from that obtained 

 on the railroad west from the summit, only in Nos. 9 and 11, which are 

 there 60 and 45 feet respectively, the latter being principally sandstone.* 



Respecting the identity of No. 19, in both sections there is no dispute. 

 It is beyond all doubt coal VIII, (Pittsburg). Aside from internal 

 evidence furnished by the seam itself, there is abundant stratigraphical 

 proof of identity. I have traced the bed, with the Crinoidal Limestone 



* See Annals Lyceum Nat. Hist., Vol. X,p. 232, where I have described the action of 

 the current causing this alteration, 



A. P. s. — VOL. XIV. 2k: 



