66 J. J. STEVENSON CAEBONIFEROUS OF APPALACHIAN BASIN 



layers, in all 18 feet 6 inches thick, the lowest at 70 feet, while a third 

 shows 6 feet in 118 feet above the Upper Sewickley, the lowest being 

 at 74 feet above that bed.* 



OBIO 



Passing over into Ohio, one finds the most northerly exposure at 

 Knoxville, in Jefferson county, about 15 miles north from Steubenville, 

 where Henry Newton obtained this section: 



Feet Inches 



1. Olive and red shale, with thin bands of 



buff limestone 76 



2. Coal bed [Waynesburg] 1 6 



3. Olive shale 108 



4. Coal bed [Sewickley ( ?) ] 2 6 



5. Olive shale 30 



6. Pittsburg coal bed 4 



This is farther north than any locality in Pennsylvania giving meas- 

 urements above the Pittsburg. Twelve miles southeast, at Eldersville, 

 in Washington county of Pennsylvania, the interval, Waynesburg to 

 Pittsburg, is 166 feet. Here the upper coal is 140 feet and is most 

 probably the Waynesburg, with red shale of the Dunkard above it. All 

 trace of limestone has disappeared and the lower coal bed is at a Sewick- 

 ley horizon. 



At 8 miles farther south, Stevenson found a thin coal bed at 65 feet 

 above the Pittsburg underlying 50 feet of shale and flaggy sandstone, 

 no trace of coal appearing. At a little way west both Professor New- 

 berry and Professor Brown note a coal bed 29 to 34 feet above the 

 Pittsburg with limestone above the lower bed and at one locality above 

 the upper. The limestone and coal disappear farther west, near the edge 

 of Harrison county, where the Waynesburg coal bed is 100 feet above 

 the Upper Sewickley, which is 69 feet above the Pittsburg. Some thin 

 limestone appears above the Upper Sewickley, but none below. The 

 interval between Sewickley and Pittsburg increases within 3 miles south- 

 ward to 81 feet, and in the lower 31 feet of that interval are two thin 

 limestones and two thin coal beds. In the southern part of .the county, 

 near the Belmont border, the interval, Waynesburg to Upper Sewickley, 

 increases to 160 feet and the Benwood limestone attains a thickness 

 of 60 feet. The Upper Sewickley is 4 feet thick, with a thin coal bed 

 35 feet below it, just midway to the Pittsburg. This lower interval 



* I. C. White : Catalogue of West Virginia University, 1883-1884, pp. 56, 60. Geology 

 of West Virginia, vol. 11, pp. 131, 132, 133, 134, 135. 

 J. J. Stevenson : Manuscript notes. 



