196 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



only horizons to be depended on are the "Big Red" and the Brookville 

 coal bed at the bottom of the Allegheny. The succession is : 



Feet 



1. Sandstone 20 



2. Red rock 95 



3. Sandstone 35 



4. "Big Red" 100 



5. Shale 20 



6. Red rock and slate 150 



7. Red sandstone and mud 40 



8. Mahoning sandstone 10 feet "\ 



Mahoning black shale 20 feet I 60 



Mahoning sandstone 30 feet J 



9. Slate 15 



10. Sandstone 80 



11. Slate 105 



12. Sandstone 30 



13. Slate and shale 15 



14. Coal bed 5 



15. Slate 25 



16. Sandstone 70 



Here one has the little coal bed of the other wells. The high red bed 

 is that associated with the Pittsburg coal at many places in Ohio, while 

 the overlying sandstone is the Pittsburg sandstone, which farther west 

 and south approaches very closely to the coal. The place of the Ames is 

 in the upper part of Number 6. The Cowrun sandstone is wanting and 

 the Mahoning is represented by Number 8. 



Four miles below Marietta, along the Ohio river, one has a partial 

 record published by Doctor White : 



Feet 



First Cowrun sandstone 23 



Interval 157 



Sandstone 100 



Interval 90 



Second Cowrun sandstone 15 



Professor Bownocker says that the highest sandstone, at its bottom, is 

 about 100 feet below the "Big Bed," 85 feet thick and overlying a thin 

 limestone which he thinks may be the Ames. The middle sandstone 

 would be about 520 below the Pittsburg and equivalent to that in the 

 Minshall well of Newport township, belonging therefore to the Alle- 

 gheny, there being no sandstone here at the Mahoning horizon.* 



• E. B. Andrews : Vol. ii, pp. 497, 502-503, 505. 

 E. Orton : Vol. vi, p. 399. 



I. C. White : Geology of West Virginia, vol. i. pp. 286, 288. 

 J. A. Bownocker : Bulletin no. 1, pp. 134-136, 169, 175-176. 



