ALLEGHENY FORMATION OF FIRST PENNSYLVANIA BASIN Qi 



Passing over into Garrett county of Maryland, one has Mr Martin's 

 measurements in the Salisbury subbasin at 7 or 8 miles from the Penn- 

 sylvania line. There the thickness of the Allegheny is given as 257 feet 

 6 inches. The Upper Freeport is in all 13 feet 5 inches thick, but con- 

 tains a parting of almost 11 feet of black slate and a thin layer of bony 

 coal. It is 136 feet above the bed designated Middle and Lower Kittan- 

 ning, a mass of shale and coal 14 feet thick, with three thin benches of 

 coal and two partings, each somewhat more than 5 feet thick. Midway 

 between these beds is another consisting of two streaks of coal, 2 and 14 

 inches respectively, separated by 12 feet of shale. A sandstone 51 feet 

 is below the Kittanning, and at 79 feet below that coal bed is another 

 double bed, the benches 8 and 12 inches, with 14 feet of shale parting 

 them. The relations are somewhat obscure, as the thickness of the Cone- 

 maugh is very much greater than at any other locality in this or any other 

 basin, being given as 718 feet, while at a few miles west and north it is 

 not far from 600 feet. 



At a few miles west, near Oakland, another section is given, being the 

 record of a boring; it is: 



Feet. Feet 



1. Mahoning sandstone 



2. Concealed, about 40 



3. Lower Freeport coal bed 2 8 



Consists of 8 layers of coal, bone and shale. 



4. Concealed, about 80 



5. Sandstone, coarse to shaly 49 9 



6. Shales 12 9 



7. Middle and Lower Kittanning coal bed 3 9 



Coal 

 Bone 

 Shale 

 Coal 



HX.1 UK 



Feet. 



Inches 



1 



4 







7 







6 



1 



4 



8. Gray shale 13 4 



9. Calcareous rock 1 2 



10. Black shale 3 11 



11. Split-six coal bed 1 7 



Feet. Inches 



Shale and bone 8 



Coal 11 



12. Shales, gray, green, red, black 73 6 



13. Shales and sandstones 18 3 



14. Fossiliferous limestone, ferriferous 1 2 



15. Alternating shale and sandstone 17 



10. Clarion coal bed 5 



17. Fireclay, flint and plastic, shale 7 4 



