MONOiSTGAHELA FORMATION ' 71 



coal decreases from 252 feet at Bellair to 202 feet at Barnesville, where 

 the higher bed is 103 feet above the Upper Sewickley. 



Stevenson's measurements in northern Belmont, beyond the central 

 part of the coimt)^, are confirmatory of these conclusions. His section is : 



Feet Inches 



1. Coal bed [Waynesburg A] 2 



2. Sandstone 40 



3. Coal bed [Waynesburg] 1 3 



4. Sandstones and thin limestones 95 



5. Coal bed [Upper Sewickley] 4 6 



6. Concealed 30 



7. Coal bed [Lower Sewickley] 2 6 



8. Fireclay 3 



9. Mostly limestone 65 



10. Shale and clay 3 



11. Pittsburg coal bed seen 2 



But this is very near the western limit of the Fishpot-Eedstone lime- 

 stone, for at a short distance toward the west a measurement shows the 

 interval between Upper Sewickley and Pittsburg, 105 feet, filled almost 

 wholly with sandstone, there being no trace of limestone. The Benwood 

 limestone practically disappears within 11 miles west from the river, 

 there being thence only a few irregular streaks and those quite argil- 

 laceous. The Upper Sewickley is usually triple, as in Harrison county, 

 with a thick middle bench; sometimes, however, the other benches are 

 wanting; the thickness varies from 4 feet 6 inches to nearly 9 feet. The 

 Pittsburg bed becomes thinner toward the west, and on that outcrop 

 does not always show the roof division. 



In Guernsey county, west from Belmont, the limestones have practi- 

 cally disappeared, there being only 5 feet in 140 feet above the Pitts- 

 burg coal bed. The Upper Sewickley is single, underlies 30 feet of sand- 

 stone, and is from 100 to 112 feet above the Pittsburg. In the extreme 

 southwest corner of the county. Professor Andrews's sections show no 

 trace of either Uniontown or Waynesburg in 113 feet above the Upper 

 Sewickley, which is 97 feet above the Pittsburg. These sections show 

 red shale 35 and 19 feet at 30 and 82 feet above the Upper Sewickley. 

 Followed westward, the Pittsburg is seen growing thinner and yielding 

 poorer coal.* 



The Pittsburg coal bed is present in southeastern Muskingum, on 

 the Guernsey-Noble border, but is very irregular, 2 feet 5 inches to 



* Belmont. E. B. Andrews : Vol. il, pp. 547, 555, 556, 557, 563, 564, 569. J. J. 

 Stevenson : Vol. Ill, pp. 274, 280, 281. C. N. Brown : Vol. vl, pp. 613, 619 

 Guernsey. Andrews : Vol. il, pp. 586, 537. Stevenson : Vol. ill, 225. 



