96 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



parting which is from a mere film to 20 feet thick. The most northerly 

 point at which the Vanport is fossiliferous is in Fox township.* 



A few patches remain in Forest county near the Elk border, showing 

 50 feet of shales and sandstone overlying the Clarion (Brookville), which 

 is 2 feet thick and rests on the Homewood sandstone. The Vanport lime- 

 stone was not seen.f 



Venango county, southwest from Forest and west from Clarion, has 

 scattered patches in the south and southeast portion, in one of which 

 Doctor Chance measured: 



Feet 



1. Ferriferous limestone [Vanport] 8 



2. Blue slate 2 



3. Coal bed [Scrubgrass] 1 to 2 



4. Concealed 8 to 10 



5. Sandstone [Clarion] 56 



6. Slate 6 



7. Coal bed [Brookville] 2 



The Vanport limestone is of uncertain occurrence. J 



In the extreme northern part of Jefferson county, south from Elk and 

 Forest, west from Clearfield, the Allegheny has been removed, but in most 

 of the county it is the surface formation, and the Upper Freeport is avail- 

 able in an extensive area within the southern third as well as in the north- 

 east near Brockwayville. A section at the latter locality shows : 



Feet 

 Upper Freeport. 



Interval 43 



Lower Freeport. 



Interval 45 



Upper Kittanning. 



Interval 54 



Middle Kittanning. 



Interval 45 



Lower Kittanning. 



Interval 75 



Brookville. 



These intervals vary little from those of Elk county, except that the' Free- 

 ports are 43 instead of 54 to 70 feet apart, and the interval from Upper 

 Freeport to Lower Kittanning is only 187 feet. The Butler and Freeport 

 sandstones are conspicuous, but the Kittanning interval is occupied by 



* C. A. Ashburner: Elk (R R), pp. 69, 73, 106, 112-113, 150, 153, 186, 214, 217-218, 

 227, 241, 245, 254. 



t C. A. Ashburner: Forest (R R), p. 307. 



t H. M. Chance: Oil Regions (13), pp. 437-438. 



