ALLEGHENY FORMATION OF SECOND PENNSYLVANIA BASIN 91 



Feet. Inches 



1. Mahoning sandstone 



2. Upper Freeport coal bed 4 



3. Fireclay, sandy shale 15 



4. Black shale and thin coal 2 



5. Upper Freeport limestone and clay 11 



6. Fireclay 5 



7. Interval 30 



8. Lower Freeport coal bed Thin 



9. Lower Freeport limestone, about 7 



10. Interval 43 



11. Upper Kittanning coal bed Blossom 



12. Interval 50 



13. Middle Kittanning coal bed 4 



14. Mostly sandstone 40 



15. Lower Kittanning coal bed 4 



16. Black shale 20 



17. Coal bed [Clarion] 6 



18. Black shale 25 



19. Clay shale 5 



to the Pottsville. This is the most northerly exposure of the little coal 

 on the Upper Freeport limestone, already seen at Bennington, in Blair 

 county. The principal sandstones of the formation are wanting and the 

 Brookville coal bed does not appear in the section. At 8 miles southeast, 

 where an anticline brings up the Allegheny, the interval between the 

 Freeport coals has increased to 76 feet, but that from Upper Freeport to 

 Lower Kittanning is unchanged. At 6 miles southeast from this place 

 the Freeports are 90 feet apart, but the interval between Upper Free- 

 port and Lower Kittanning is barely 200 feet, a little less than in the 

 measured section given above. The Clarion sandstone is massive, 25 feet 

 thick, and rests on the Brookville coal bed, which is a mass of coal and 

 shale 7 feet thick. On the Conemaugh river one finds the Upper and 

 Lower Freeport and Johnstown cement limestones ; the Freeport and Kit- 

 tanning sandstones are distinct, though hardly cliff-making, while the 

 Clarion is massive, 30 feet thick, and rests on the Brookville coal. The 

 coal beds for the most part are not important. The Upper Freeport is 

 often thick, but usually slaty ; the Lower Freeport is variable in thickness 

 and always poor, while the Lower Kittanning, though often thick and 

 mined, never yields coal comparable with that obtained from this bed in 

 Cambria county.* 



Stevenson's work in Westmoreland and Fayette counties seems to dis- 

 agree with that of observers in adjacent areas, because his nomenclature 



* W. G. Piatt: Indiana (H 4), pp. 65, 121, 125, 139, 14! 



