MONONGAHELA FORMATION 47 



The measurements are from the Consolidated shaft, the Borden shaft, 

 Lonaconing and Mineral county of West Virginia, arranged in the order 

 from north to south. At Lonaconing one finds about 20 feet of coal in 

 a total of 34 feet; at the Borden shaft the carbonaceous matter is dis- 

 tributed throughout 22 feet of black shale between the highest portion 

 and the Main coal. The lowest division is known throughout as the 

 "Big vein." The interval from the Waynesburg to the Pittsburg as 

 here described is 205 to 311 feet.* 



WEST FROM THE ALLEGHENY MOUNTAINS, IN PJENNSTLVANIA 



The First and Second bituminous basins. — A small area of Mononga- 

 hela, known as the Salisbury basin, remains within the First basin in 

 Somerset county at about 50 miles southwest from Broad top and 20 

 miles northwest from Cumberland, in Maryland. It embraces about 

 20 square miles and extends from near Meyersdale southward almost to 

 the Maryland line. Its great coal bed was identified with the Pittsburg 

 by Professor J. P. Lesley in 1839. The area was examined in 1876 

 by F. and W. G. Piatt and J. J. Stevenson, who, while agreeing as to 

 the measurements, by no means agreed respecting the relations of the 

 beds, t The section at the north end of the area, as given by the Messrs 

 Piatt, is : 



Feet 



1. Coal bed, Uniontown 2 



2. Clay 1 to 6 



3. Limestone 10 



4. Slates '. . 42 



5. Black slate 3 



6. Coal bed 1 



7. Clay 1 



8. Black slate 15 



9. Coal bed BlosRom 



10. Limestone 5 



11. Concealed 52 



12. Coal bed. Redstone Blossom 



13. Concealed 15 



14. Black shale 10 



15. Pittsburg coal bed 10 



This section is distinct for three miles southwardly to near Salisbury, 



• p. T. Tyson : Second rept. Agric. Chemist, 1862, pp. 46, 47. 

 C. C. O'Han-a : AUegany county, pp. 125, 126, 127, 177, 180. 

 G. C. Martin : Garrett county, pp. 141, 142. 

 I. C. White : U. S. Geol. Survey Bulletin, no. 65, pp. 56, 63. 

 t But Stev-enson in his report on the Fayette and Westmoreland district accepted 

 the conclusions of his colleagues, as they had been adopted by the Director of the 

 Survey. 



