White.] 



490 



[Oct. 20, 



No. XII. 

 194' 



12. Sandstone, flaggy and massive 30' 



13. Massive sandstone, pebbly 60' 



14. Very pebbly bed 5' 



15. Massive sandstone, scattering pebbles 65' 



16. Shale, dark, containing fossil plants 10' 



( coal 10" ) 



17. Coal, Quakertown? \ shale 3" >• 1' 6" 



( coal 5" ) 



18. Fire clay 7' 



19. Black, fissile slate 15' 



30. Concealed 90' 



21. Shales, reddish 35' 



22. Sandstone, rather massive, greenish 35' 



23. Concealed, with occasional outcrop of green, 



flaggy sandstone to level of Cheat river at 

 mouth of Bull run (960 A. T. Bar) 65' 



The structure of the Upper Freeport coal and limestone as given above, 

 was obtained at a new opening on the road which crosses Bull run above 

 Swindler's mill, and leads southward. The coal has been mined on the 

 land of Mrs. Spurgeon in the immediate line of the section, but the open- 

 ing had fallen in when I visited the locality, and tlie coal could not be seen. 

 The coal is pitchy black with resinous lustre, is rather free from pyrite, 

 and has every physical appearance of a good coking coal. The central 

 bench just below the 3" shale, is not so good as the rest of the bed, being 

 somewhat slaty on the outcrop. 



2he Upper Freeport limestone is fully exposed in the ravine below the 

 coal, and seems quite pure throughout, being light gray, very compact, and 

 breaking with a sharp clean fracture. It contains a minute, univalve 

 fossil. 



The basal portion only of the Freeport sandstone (No. 7) is visible ; it is 

 a coarse, grayish-white, micaceous sand rock, specked with ferric oxide, 

 and very much resembles the same bed in western Pennsylvania. 



The great sand-rocks of No. XII are completely exposed at this locality, 

 and as will be seen from the section contain no coal until we come down 

 to the Quakertown horizon, the Homewood sandstone having merged with 

 the underlying beds, thus shutting out the Mercer coal and shale series at 

 this locality, and giving us 160' of rock in one solid mass. 



The little coal bed, No. 17, is identical with that given in Sec. 3, at the 

 mouth of Quarry run, and here, as there, is also double, and underlain by 

 a large bed of black slate. The coal is quite pure, and contains much 

 mineral charcoal. In the dark shales above it, were seen some fragments 

 of Cordaites and leaves of Lepidodendron. 



In the section at Quarry run, 35' more of No. XII, principally massive 

 grayish-white sandstones, occur below this coal, but here, on Bull run, 

 everything is concealed at this horizon, and the character of the interven 



