86 J. J. STEVENSOZSr CAEBONIFEROUS OF APPALACHIAN BASIN 



Feet Inches 



12. Shale , 5 



13. Redstone limestone 6 



14. Shale 13 



15. Pittsburg coal bed 8 6 



The sandstone at the top of the section is 320 feet above the Pittsburg 

 coal bed. Stevenson's sections along the railroad beyond Clarksburg 

 show the Eedstone and Sewickley at 30 and 41 feet above the Pittsburg, 

 with the Sewickley sandstone, 40 feet thick, at 6 feet above the coal bed. 

 On top of the sandstone is black shale, 6 feet, containing 2 inches of coal 

 and marking the place of the Upper Sewickley. The Benwood limestone 

 is represented by only 7 feet of limestone and calcareous shale, at about 

 8 feet above the Upper Sewickley. Stevenson reports a coal bed at 

 Clarksburg, 160 feet by barometer, above the Lower Sewickley; but this 

 interval cannot be depended on, as all of the intervals by barometer given 

 in the paper here quoted are too small. This bed may be at the Union- 

 town horizon. It is identified with a bed seen at 9 miles west from 

 Clarksburg, 4 feet thick, divided by one foot of clay. 



At Brown's mills, 10 miles northwest from Clarksburg, a record kept 

 with unusual care shows: 



Feet 



1. Waynesburg sandstone 25 



2. Waynesburg coal bed 3 



3. Slate 15 



4. Gilboy sandstone 35 



5. Shale 80 



6. Uniontown coal bed 5 



7. Shale and "limestone" 265 



8. Pittsburg coal bed 10 



Doctor White has recognized the Waynesburg, Waynesburg A, and 

 Washington coal beds in surface croppings near this boring, so that 

 there remains no room for doubt respecting the correlation. The Gilboy 

 sandstone, whose top is 385 feet above the Pittsburg, is no doubt included 

 in the great sandstone at Clarksburg, whose bottom is 320 feet above that 

 coal bed, for, as will be seen, the bed varies greatly in thiclniess. A de- 

 tail record 3 miles eastwardly from Browns shows no coal at the place 

 of the Waynesburg, the sandstone is wanting, and the Washington coal 

 bed is 538 feet above the Pittsburg, 23 feet more than in southeast Wetzel, 

 10 miles northwest. Near Cherry Camp, on the Baltimore and Ohio 

 railroad, 10 miles west of south from Browns and a similar distance west 

 from Clarksburg, a detailed record shows the Washington at 568, the 

 Waj^nesburg A at 481, and the Uniontown, 2 feet thick, at 287 feet 

 above the Pittsburg. The intervals are all larger than at Browns. The 



