88 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



Here the interval from Lower Freeport to Middle Kittanning is about 

 143 feet; at the other measurement it is about 10 feet less from Upper 

 Freeport to the Kittanning. The Split-six may be part of the Lower 

 Kittanning. The fossiliferous limestone, Number 15, correlated with the 

 Vanport of western Pennsylvania, is rich in marine forms, mostly 

 brachiopods, at this locality. A limestone at varying distances below 

 the Lower Kittanning has been observed in Garrett and Allegany coun- 

 ties of Maryland, but elsewhere in this region it contains only forms of 

 doubtful affinity. Whether this be the same with the fossiliferous lime- 

 stone of the boring can hardly be asserted positively. This Herrington- 

 Manor limestone is at a very great distance below the Kittanning as com- 

 pared with that of the Vanport farther west. The flint clay under the 

 Clarion (Brookville) coal is a common feature farther west. 



Doctor White gives a section in Preston county of West Virginia, 

 within the Johnstown subbasin, which shows the Upper Freeport at about 

 56 feet above the Lower Freeport and about 141 feet above the Middle 

 Kittanning, which is 90 feet above 1 foot of coal separated by 18 feet 

 from a mass of coal and clay 8 feet thick. It is not impossible that the 

 Lower Freeport of the Herrington-Manor section is the Upper, as the 

 bed shows the same general structure throughout, but improves west- 

 wardly, being of much economic importance in this portion of Preston 

 county.* 



SECOND BITUMINOUS COAL BASIN OF PENNSYLVANIA 



The Second bituminous basin of H. D. Eogers, lying west from Laurel 

 Hill, is narrow and well defined, having in most of its extent the great 

 anticline of Chestnut hill as its western boundary. The most northeast- 

 erly patches of Allegheny are in Tioga county, not far from the line of 

 New York, whence the formation can be followed across Clinton, Center, 

 Clearfield, Cambria, Indiana, Westmoreland, and Fayette counties of 

 Pennsylvania into Preston county of West Virginia. 



Mr Piatt gives measurements at six localities in the Blossburg and 

 other areas of Tioga county, showing six coal beds varying greatly in 

 thickness, as do also the intervals between them. Only one of them is of 

 economic importance, the Bloss, which is the fourth in descending order. 

 Mr David White regards this as equivalent to the bed B of Lycoming 

 county, which he refers to the Mercer horizon of the Pottsville. Only 



* G. C. Martin : Maryland Geol. Survey, Garrett county, 1902, pp. 116-117, 119, 129. 

 I, C, White : Bulletin no. 65, p. 76. W. Va. Geol., vol. ii, pp. 349, 409, 411. 



