166 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



Gallitzin. The Mahoning is often represented by pebbly rock in the 

 southern part of the county, but it is mere shale quite as frequently.* 



Almost 150 feet of Conemaugh remain in northern Cambria, but ex- 

 posures for measurement are reached first at Bennington on the Cambria- 

 Blair border, 20 miles south from the Clearfield line. There Mr Piatt's 

 section shows a 10-inch coal bed separated by 35 feet' of shaly measures 

 from the Upper Mahoning sandstone, 50 feet thick, which overlies a 2 

 feet 8 inches coal bed, with 55 feet of shaly beds intervening to the 

 Upper Freeport coal bed. The highest coal, 142 feet above the Upper 

 Freeport, seems to be the Brush Creek and the intermediate bed is the 

 Gallitzin. At Gallitzin, a few miles west in Cambria, Doctor White finds 

 the Brush Creek 140 feet above the Upper Freeport; but at Cresson the 

 section shown in a shaft is : 



Feet. Inches 



1. Slates 60 



2. Sandstone 9 



3. Fireclay 8 



4. Sandstone 109 



5. Coal 1 



6. Fireclay 9 



7. Sandstone 17 



8. Clay, shale, sandstone 34 



9. Sandstone 33 6 



10. Slate and sandstone 14 



11. Upper Freeport coal bed 



This is not unlike sections in the second basin and one may regard the 

 coal, Number 5, as an upper split of the Gallitzin, the place of a lower 

 split being on top of the fireclay, Number 8. 



Mr Fulton's section near Johnstown, in southwest Cambria, shows the 

 Gallitzin at 67 feet above the Upper Freeport with the Mahoning lime- 

 stone or Johnstown ore at a few feet below it. The Brush Creek coal bed 

 is absent and at 148 feet above the Upper Freeport is a red bed, this being 

 the most northerly locality at which red shale occurs. The section extends 

 upward to 302 feet, but neither here nor at Cresson are there any traces 

 of the Barton coal bed or of the limestones belonging in that interval, f 



In the deep Salisbury subbasin of southeastern Somerset county a full 

 section may be compiled from the measurements made by F. and W. G. 

 Piatt, which accords somewhat closely with that made by Doctor White 



* H. M. Chance: Revision of Clearfield county (H 7). 



I. C. White: U. S. Geol. Survey Bull. no. 65, p. 124. 

 f F. Piatt: (T), p. 95; (H 2), p. 61. 



J. Fulton: (H 2), p. 97. 



A. A. Prosser and D. B. Hardin : Appendix to H 3, p. 369. 



