THE ALLEGHANY COAL FIELD. 109 



Feet. 



36. Coal, 4 



37. Grit and Shale, - - - 40 



38. Coal, 2 



39. Grit and Shales, hills eight miles above Stenbenville, 50 



1121 



At Jackman's three hundred and fifty feet above the 

 "Big Vein," and, at the summit of the hills, six hundred 

 and six feet above Lake Erie^ is a bed of limestone ten feet 

 thick, that is not identified on the Ohio River, so frequent 

 are the changes in the composition of the beds. 



It would be interesting to add more of this section, and 

 extend it to the great seam of coal at Wheeling, but this 

 article has already become lengthy, and I proceed to give 

 sections of the " Lower Coal Series " in Pennsylvania. 



No. IV. 



SECTION OF COAL ROCKS IN THE VALLEY OF THE ALLEGHANY 



RIVER. GEOL. REP. PA. 1840. 



Feet. 



1. Conglomerate or White Sandstone, at the mouth of 

 Clarion River, 



2. Shale, with thin ore and coal, 12| 



3. Coal, li 



4. Sandstone and Shale, 40 



5. Coal, - - 4 



6. Shale, 20 



7. Limestone, mouth of Kiskeminitas, - - - 15 



8. Buliv Stone and Iron Ore, 3 



9. Shale, 25 



10. Shale and Coal, - - - 11 



11. Grit, - - - 70 



12. Coal, - - - 2^ 



13. Sandstone and Shale, Freeport, - - - - 50 



14. Limestone, - - - - 6 



15. Coal, one hundred and forty feet above the river at 

 Freeport, 4 



