110 J. J. STEVENSON CARBONIFEROUS OF APRALACHIAN BASIN 



On the high ridge of central Greene there are several limestones which 

 Stevenson designated by numbers. XI and XII are, in round numbers, 

 at 80 and 160 feet above the Nineveh limestone and are persistent in the 

 five townships of Greene county in which their place is exposed; they 

 are concealed in the southwest townships of Greene and in the adjacent 

 part of West Virginia. XI is always thin, but XII is from 8 to 15 feet 

 thick and appears to be associated with much chert in Morris township of 

 Washington county. This was not seen in place, but it is above XI on 

 a hill which reaches almost to XII. A thin limestone at 30 feet higher 

 underlies a coal blossom which is at the place of the highest coal in Pro- 

 fessor Andrews's Baresville section, 150 feet above the Nineveh limestone, 

 and the name has been assigned to it for that reason. Two higher lime- 

 stones are present on this ridge, of which the upper is 275 feet above the 

 Nineveh coal bed and about 30 feet below the Gilmore sandstone. It is 

 exposed only in Center and Jackson townships of Greene, but it was 

 found in a well in Gilmore township. It is evidently the limestone 

 found in Wetzel township at about 100 feet below the Windy Gap lime- 

 stone. This, which may be termed the Jackson limestone, seems to be 

 clearly persistent along a line of more than 30 miles, beyond which in- 

 formation is lacking. It is a tough, impure rock containing some 

 crystalline sphalerite and is associated with plant-bearing shales in Jack- 

 son township near White Cottage. 



The Gilmore sandstone (J. J. Stevenson, 1876), 30 feet thick, caps 

 the high knobs of southwest Greene, and it has been followed along the 

 middle line of the trough for 40 or 50 miles by Doctor White. It is soft, 

 somewhat incoherent, and is apt to weather into large cavities. At 30 

 feet higher is a black shale, which occasionally carries some coal, and 

 Doctor White has called it the Windy Gap coal bed (1891). The Windy 

 Gap limestone (I. C. White, 1891), 30 feet above the coal bed, is on two 

 or three knobs within Greene county and in Monongahela and Wetzel 

 to 10 miles south from the Pennsylvania line. It is a rather pure lime- 

 stone and, like the Jackson, contains some sphalerite. The formation is 

 capped by a massive sandstone seen occasionally in Marshall and Wetzel 

 counties of West Virginia the highest stratum of the Paleozoic in the 

 Appalachian basin. 



Eed shales in the interval between the Waynesburg and Washington 

 coal beds find their chief development in what may be termed the "red 

 area" of West Virginia and Ohio. The individual beds within Wood, 

 Jackson, and Mason of West Virginia and Meigs of Ohio are from 25 

 to 100 feet thick. In Tyler, Doddridge, Eitchie, Wirt, and Calhoun of 

 West Virginia, east Washington and east Monroe of Ohio, a bed is very 



