Chapter V. 



The Poltsville Conglomerate, No. XII 



As has been said, there remains a sharp triangle of this 

 formation at the point of the Lackawanna anthracite coal 

 basin, (Forest City basin,) in the corner of Susquehanna 

 county and the adjoining border of Wayne, — a patch of 

 wilderness, — the strata dipping faster than the streams, — 

 natural rock sections therefore few and isolated, and only 

 one rib or bluff visible at a time. A detailed section at For- 

 est City was therefore not attempted. 



Further sonth, however, all the rocks of XII are well ex- 

 posed on both sides of the basin. 



Opposite Scranton on the southeast side of the basin, along 

 the line of the Delaware, Lackawanna and Western railroad, 

 up Roaring Branch creek, to the tunnel near the falls, I ob- 

 tained the following section, shown in Fig. 1. 



Upper division of XII. 



1. Scranton Sandstone, current-bedded, pebbly, 75' 



Middle division of XII. 



2. Shale, 5' 



3. Coal and coal-shale, 4' to. 6' 



4. Shales and coal-shale, . . . . • 20 



5. Sandstone, buff, 20' 



6. Forest City (?) coal bed, 5' 



7. Fire-clay, .... 4' 



8. Shales, blue, sandy, 20' 



9. Sandstone, buff-white, 18' I 



10. Coal-shale, 3' |> 180' 



11. Shale, gray, sandy, 8' 



12. Coal and coal-shale, 3' 



13. Shale, bluish gray, 8' 



14. Sandstone, buff, 35' 



15. Coal-shale, 3' 



16. Shale, gray, 5' 



17. Coal-shale, ... 2' 



18. Slate, dark, very bituminous, Lt base, 15' 



( 45 G 5 . ) 



