98 J. J. STEVENSON^CARBONIFEEOUS OF APPALACHIAN BASIN 



and often to some extent conglomerate. In the interior of Washington 

 county, as well as in Allegheny county, it is apt to be shaly, but in the 

 ■western part of the former county it is usually massive. Oil-well records 

 show it to be persistent as a massive sandstone in Greene county and the 

 northern counties of West Virginia, often 70 feet thick and sometimes 

 continuous downward to the Uniontown sandstone. Farther south the 

 conditions are irregular; sandstone, often very thin, is generally present 

 within the interval in Doddridge, Ritchie, and Wood counties. Farther 

 south a sandstone is in Putnam county at about 240 feet above the Pitts- 

 burg. Though the -tracing is not complete, enough is known to render 

 most probable that this is the same with the sandstone of Jackson county 

 and of Meigs in Ohio, which is the Waynesburg. Along this southern 

 border the rock is massive, more or less conglomerate, with white quartz 

 pebbles often an inch in diameter. In Meigs, Morgan, and Athens of 

 Ohio it is the upper sandstone and conglomerate mentioned by Professor 

 Andrews. Along the western outcrop it is insignificant in Muskingum, 

 but farther north, in western Belmont, in Harrison, and southern Jeffer- 

 son, it is a well marked sandstone. The sandstone of this interval is 

 insignificant and at times replaced by sandy or even clayey shale within 

 a large interior area embracing Ohio, western Marshall and Wetzel, 

 Tyler, Pleasants, and Wood county of West Virginia as well as eastern 

 Belmont, Monroe, and most of Washington county of Ohio. 



The Waynesburg A coal bed. . . Maryland and Pennsylvania : Waynesburg A. 

 J. J. Stevenson, 1876. Ghio: XII, Washington. West Virginia: 



Waynesburg A, Washington. 



This coal bed, just above the sandstone, is rarely more than 3 feet 

 thick, usually much less and nowhere of even local importance. It is 

 apparently absent from Allegheny county, but it was seen at almost 

 every place in the four southwest counties of Pennsylvania, as well as 

 in the northern counties of West Virginia. In Ohio it is distinct in 

 Harrison, Jefferson, Belmont, and Monroe, where the observations are 

 numerous, and it has been reported occasionally in Muskingum, Noble, 

 and Washington, where recorded observations are very few. The geo- 

 graphical extent of this small bed is even more remarkable than that of 

 the Uniontown, for the latter is of real value in a few areas, whereas this 

 bed is always too thin to be of use. It differs from the Uniontown in 

 that it is almost invariably coal, whereas the lower bed is often merely 

 black shale for long distances. 



The Waynesburg B coal bed (J. J. Stevenson, 1876) is equally insig- 

 nificant in thickness and is found in only a limited area within south- 



