198 J. J. STEVENSON — CARBONIFEROUS OF APPALACHIAN BASIN 



Wood county extends westward from Ritchie to the Ohio river. It is 

 difficult here to determine the Pottsville. A record in northwestern part 

 of the county shows two plates of sandstone, 120 and 100 feet respect- 

 ively, separated by 90 feet of blue and black shale. The lower plate 

 rests on the limestone. In much of the county the Mauch Chunk is 

 wanting, and the Pottsville is continuous with the Logan or separated 

 from it by a shale mass so thin that drillers seldom note it. At Parkers- 

 burg, on the Ohio, the two sandstone plates are present, each 50 feet and 

 separated by 25 feet of black shale. The Logan is at a few feet below.* 



Returning now to the easterly side, one finds at Vadis, on the Lewis- 

 Gilmer line and 15 miles southeast from Oxford, the Pottsville, begin- 

 ning at 868 feet below the Pittsburg, as follows : 



Feet 



1. Sandstone 20 



2. Shale 7 



3. Sandstone 18 



4. Shale 45 



5. Sandstone. ... 80 



6. Shale 67 



7. Sandstone 53 



One is now approaching the region where the Pottsville begins to 

 thicken, and at Glenville, in Gilmer county, 12 miles west of south from 

 Vadis, the top of the Pottsville is at 875 feet below the Pittsburg coal 

 bed. The section is 



Feet 



1. White sandstone, with gas. 18 



2. Coal bed 3 



3. Black slate 45 



4. Gray sandstone 11 



5. Black slate 235 



6. White sandstone, with gas 164 



7. Blue and black slate 32 



8. White sandstone 24 



9. Black slate 50 



with 135 feet of blue and red shale to the limestone. Taking the shales 

 as Shenango, the thickness of Pottsville is 545 feet. The " Clarion " (?) 

 coal bed is at 8 feet above number 1. The coal bed, number 2, belongs 

 to the Mercer group. The incomplete record of a well at Stumptown,on 

 the Gilmer-Calhoun border and 12 miles southwest from Glenville, shows 

 the same condition ; for, beginning at 895 feet below the Pittsburg, the 

 section is 



*I. C White: Op. cit,, vol. i, pp. 248, 250, 285, 302-303, 304, 318, 321, 325, 333. Bull. no. 65, pp. 

 129, 189. 



