MONONGAHELA FORMATION 87 



Gilboy sandstone is 25 feet thick and 94 feet above the Uniontown, the 

 same as at Browns, making allowance for thinning of the rock. At 

 Salem, west from Cherry Camp, the Washington is 546 feet above the 

 Pittsburg; no Waynesburg is here, but a 35-foot sandstone is at 405 

 feet, as at Browns. Farther south, in western Harrison, a Sewickley 

 coal bed is at 80 and the Uniontown coal bed at 280 feet above the Pitts- 

 burg. 



The Pittsburg coal bed attains great thickness in Harrison, Barbour, 

 and Lewis counties. The roof division, so well marked in most of Penn- 

 sylvania and Ohio, is seen rarely, but very often a black slate rests on the 

 "over-clay." The thickness from Clarksburg eastward is not far from 

 8 feet and one opening shows almost 9. There is a tender middle bench, 

 the "bands," answering to the 'T)earing-in-bench" of Pennsylvania and 

 Ohio, separating the 'iDreast" from the "bottom." The "breast" usually 

 contains a good deal of hard coal, often much semi-cannel, but the 

 'Taottom" is a softer coal, lower in ash, and all very good except a few 

 inches on the floor. The whole bed gives marketable coal. The thick- 

 ness decreases west from Clarksburg and at times falls to 5 feet. 



The only red shale recorded in the Clarksburg region is a thin bed, 

 sometimes replacing the upper part of the Sewickley sandstone. There 

 is none in the Brown record; but records farther south, on the west side 

 of the county, show 10 and 30 feet at 350 and 349 feet above the Pitts- 

 burg, the former belonging to the deposit below the Uniontown and the 

 latter underlying the Gilboy sandstone, which in turn underlies almost 

 immediately the place of the Waynesburg coal bed.* 



Doddridge county, west from Harrison, is south from Wetzel and 

 Tyler. At Sedalia, on the eastern border, 7 or 8 miles south of west 

 from Browns and 6 or 7 miles northwest from Cherry Camp, is the 

 measurement of a core obtained by Mr Barnes, thus: 



Feet Inches 



1. Mostly Shale 61 



2. Black and gray shale 2 



3. Blue shale 4 



4. Sandy shale 12 



5. Sandstone 83 



6. Blue shale 17 8 



7. Coal bed [Uniontown] 3 2 



8. Shales and limy shales 184 2 



9. Coal bed 6 



10. Shales and sandstones 83 



11. Pittsburg coal bed 6 10 



* I. C. White : Bulletin no. 65, pp. 49. Geology of West Virginia, vol. 1, pp. 248, 

 360 ; vol. la, pp. 316, 317, 319, 320 ; vol. ii, pp. 139, 140, 141. 



J. J. Stevenson: Proc. Am. Phil. Soc, vol. liv (1875), pp. 377, 378, 381. 



