1875.] 



373 



[StevensoD. 



Pennsylvania border near the junction of Ohio and Marshall counties, 

 West Virginia, to a little below Moundsville, on the Ohio River. This is 

 the overlying group in Doddridge, Tyler and Wetzel counties, as well as 

 in the eastern half of Rit jhie and the western portions of Monongalia, 

 Marion, Harrison, Lewis and Gilmer counties. 



The sudden cutting off of this group by the Ellenboro' fault and the 

 consequent wearing away of the rocks by erosion prevent us from ob- 

 taining as full a section along this line as may be found farther north. 

 The succession as observed here is as follows : 



Ft. In. 



1. Sandstones and shales. 400 



2. Black shale 2' 



3. Coal "Brownsville" 3' 



4. Shale 20' ^ 



5. Sandstone 5-15 V Interval, 38 ft. to 28 ft, 



6. Shale 3 ) 



7. Coal 2 



8. Shale 20 \ 1 -5 ff 



9. Sandstone and some shale.. . . 55 ) ; ■ 



The total thickness of the group as here exposed is only five hundred 

 and twenty feet. For comparison, I present a condensed form of the 

 excellent section worked oat by Mr. I. C. White,* in southwestern 

 Pennsylvania and northwestern West Vii'ginia : 



Ft. In. 



1. Sandstones and shales, 300 ^ 



2. Limestone 1 6 ^^ 491 1 ft. 



3. Sandstone 190 ) 



4. Coal 1 6 



5. Sandstone 95 \ Interval, 95 ft. 



6. Coal 2 



7. Shale and sandstone 85 "x 



8. Limestone 3 > Interval, 128 ft. 



9. Shale 40 3 



10. Coal 1 4 



11. Shale 10 ^ 



12. Limestone 2 > Interval, 52 ft. 



13. Shale 40 ) 



14. Coal " Brownsville " 2-3 6 



15. Shale 20 \ Interval, 20 ft. 



16. Coal 1 



^l-^J"^^! ; ^^ \ Interval, 60-65 ft. 



18. Sandstone , 45-50 ) 



In this section the total thickness is eight hundred and sixty feet. It 

 * Annals Lyceum of N"at. Hist, Vol. XI, p. 46. 



