122 STRATIGRAPHY THE MONONGAHELA SERIES. 



per Sewickley Sandstone, and from 90 to 140 feet above the 

 base of the Monongahela Series, has little areal extent or 

 thickness in Lewis and Gilmer. In Lewis it is almost wholly 

 absent, only one opening being observed, as follows : 



Conrad Heirs Prospect No. 38 on Map II. 



On Canoe Run, 0.6 mile northwest of Roanoke, Collins Settlement 

 District; Sewickley Coal; elevation, 1110' B. 



Ft. In. 



Sandstone, massive, pebbly, Sewickley 10 



Shaie, sandy 10 



Coal, thickness concealed, reported 2 6 



In Gilmer there is a small quantity of Sewickley Coal in 

 the vicinity of Tanner, Dekalb District, but it is too thin and 

 slaty to be of value. One of these outcrops, Exposure No. 

 39 on Map II, in the public road at Tanner, has already been 

 noted in the section for Tanner, published in Chapter IV. The 

 following was noted along the public road farther down the 

 creek : 



Coal Exposure No. 40 on Map II. 



On Tanner Creek, 1 mile northwest of Latonia; Sewickley Coal; 

 elevation, 730' B. 



Ft. In. 



Sandstone, massive, Sewickley 



Shale, sandy 10 



Coal 0' 4" ] 



Slate, gray 2 }- 10 



Coal 4 J 



Slate, gray 



At Prospect No. 41 on Map II, 0.3 mile west of Latonia, 

 the Sewickley Coal had once been opened at an elevation of 

 785' B., but apparently not much coal was found, the blossom 

 which appears in the road at the same level being only 0' 8" 

 thick. 



In Center District at the Sylvester Maxwell Prospect, No. 

 42 on Map II, on Road Run, 2.2 miles northwest of Norman- 

 town, now fallen shut, the Sewickley Coal was reported 1 foot 

 thick, being at an elevation of 1000' B. 



