ALLEGHENY FORMATION OF FIRST PENNSYLVANIA BASIN 83 



A structure which bears no resemblance to that of the Lower Freeport is 

 southwest Center. Doctor White's section at Houtzdale, 7 or 8 miles 

 southwest from Morrisdale, is : 



Feet. Inches 



1. Mahoning sandstone, about 100 



2. Upper Freeport coal bed 5 4 



3. Interval 42 



4. Lower Freeport coal bed and thick partings. . 13 



5. Freeport sandstone and shale 36 



6. Dark shale 14 



7. Upper Kittanning coal bed 3 



8. Fireclay and dark shale 33 



9. Middle Kittanning coal bed 1 



10. Slate, sandstone, shale 10 



11. Lower Kittanning coal bed 4 



12. Fireclay and shale 10 



13. Hard sandstone [Kittanning] 32 



14. Shales 21 



15. Clarion coal bed [Brookville] 3 6 



16. Hard fireclay 



The Upper Freeport has the same structure' as in Snowshoe. N~o ob- 

 server notes the occurrence of limestone until 8 miles west-southwest from 

 Houtzdale, where Mr Piatt found a 6-foot bed at 14 feet below a thin coal 

 which he is inclined to take as Lower Freeport ; but it may be the Upper 

 Freeport limestone, as that is evidently present in the southern part of 

 the county.* 



The section is followed readily into Cambria, and at Bennington, on 

 the Blair County border, Mr Fulton's long section shows all the coal beds 

 present except the Gorman, with in addition a thin bed just above the 

 Upper Freeport limestone. That is the only limestone in the section and 

 is broken into many layers, which with the intervening shales occupy 

 most of the interval to the Lower Freeport coal bed. Of the important 

 sandstones, only the Freeport is noteworthy, the others being represented 

 mostly or altogether by shale. At a few miles southwestwardly, in this 

 easterly, or Wilmore, subbasin, many sections have been obtained, several 

 of which have been grouped by Mr d'Invilliers. Condensed, these are : 



* F. Piatt: (H), pp. 34, 85, 105. 

 H. M. Chance: (H 7), pp. 38, 41-42, 53, 55, 61, 64. 

 I. C. White : Bulletin no. 65, u. 124. 



