42 J. J. STEVENSON CAEBONIFEROUS OF APPALACHIAN BASIN 



and in that county as well as Greene it is absent from few sections in 

 which its place is exposed. It disappears quickly southward in West 

 Virginia, where it is without representative almost everywhere in the 

 exposed area. It persists across the northern panhandle into Belmont 

 county of Ohio, but thence there is little information respecting it, as 

 few detailed sections extend above the Uniontown (Hobson) horizon. 

 An impure limestone is reported occasionally at 30 to 40 feet above 

 the Uniontown coal bed. 



A sandstone sometimes appears between this limestone and the 

 Waynesburg coal bed, but it is unimportant except in western Marion 

 and northern Harrison of West Virginia, where it is massive and ex- 

 tends downward below the place of the limestone. This was termed the 

 Gilboy sandstone by Doctor White. 



The Little Wajmesburg coal bed (J. J. Stevenson, 1876) is an unim- 

 portant horizon, economically, as the coal rarely attains workable thick- 

 ness. Like the Uniontown, its areas of moderately thick coal are far 

 away from the borders of the field, as marked by the Pittsburg and 

 Waynesburg coal beds. It is found commonly as a thin coal, one foot 

 or less, at very many places in southwest Pennsylvania and immediately 

 adjacent parts of West Virginia, but it seems to be wanting in Mary- 

 land, Ohio, and practically all of West Virginia. It is separated by a 

 variable interval from the limestone below. 



The Waynesburg coai bed Maryland : Koontz, Waynesburg. Pennsyl- 



H. D. Rogers, 1858. vania and West Virginia : Waynesburg. 



Ohio: Tunnel, XI, 



This bed, at the top of the formation, is a notable deposit in the north- 

 ern part of the field and is apparently present wherever its horizon is 

 reached in Maryland, Pennsylvania, northern Ohio, and northern West 

 Virginia. Measurements in Pennsylvania are almost as numerous as 

 are those of the Pittsburg, and it is the principal source of domestic 

 supply in considerable areas, though its coal is so inferior that the bed 

 rarely attains commercial importance. It is thin, 3 to 4 feet, including 

 partings, along the northern border in Pennsylvania and in Ohio. In 

 the latter state it is usually very thin and it seldom appears in sections 

 south from Belmont county. Traces of it are reported occasionally in 

 Morgan, Monroe, and Noble counties, while in Meigs and western Wash- 

 ington a thin coal bed sometimes appears under the upper conglomerate 

 of Andrews. The bed is present at Wheeling on the Ohio, but farther 

 south becomes thin and apparently disappears within 30 miles. 



In its full development the bed is double, triple, quadruple, or even 



