82 J. J. STEVENSOK CARBONIFEROUS OF APPALACHIAN BASIN 



that of Greene county of Pennsylvania. The formation soon passes below 

 the surface, and thence across the state it can be followed by means 

 of oil-well records. 



In Monongalia county, at a few miles south from the Pennsylvania 

 line, one has the carefully measured section by Doctor White : 



Feet Inches 



1. Waynesburg coal bed 10 10 



2. Black shale 1 



3. Sandy shale 25 



4. Waynesburg limestone 8 



5. Sandy shales, layers of limestone 30 



6. Massive sandstone 20 



7. Limestone and shale 15 



8. Black shale, Uniontown horizon 2 



9. Limestone and thin shales 105 



10. Sewickley sandstone 40 



11. [Lower] Sewickley coal bed 5 . 



12. Shale and sandstone 15 



13. Limestone ") f 15 



14. Shales and concealed I [Fishpot] ) 23 



15. Limestone ) ( 7 



16. Concealed 15 



17. Redstone coal bed 4 



18. Redstone limestone 18 



19. Shale and slate 10 



20. Pittsburg coal bed 13 10 



The multiple Waynesburg bed has this structure : 



Coal, 2 feet ; shale, 1 foot ; coal, 1 foot 4 inches ; shale, 1 foot 6 inches ; coal, 

 5 feet; 



and the Pittsburg is: 

 Roof, coal, and slate, 3 feet 3 inches ; clay, 1 foot ; Main coal, 9 feet 7 inches. 



The total thickness of the formation is 373 feet 8 inches. The inter- 

 val from Waynesburg to Uniontown is 99 feet and that to the Lower 

 Sewickley is 246 feet. At Fairmont, 20 miles south, in Marion county, 

 the intervals are almost the same, the Eedstone coal bed is absent, 

 and the Waynesburg, with 4 feet 6 inches of coal, is barely 6 feet thick. 

 The Waynesburg, Uniontown, Benwood, Fishpot, and Redstone lime- 

 stones are all present and distinct, but no trace of the Little Waynes- 

 burg coal bed appears in any of the sections. 



The measurements of two cores from diamond drill are available a 

 few miles west — one in Monongalia county measured by Mr J. E. Barnes, 



