VIRGINIA 151 



the Cumberland plateau in that state and in Kentucky. This is the 

 11 Bee rock " of the sections in Penningtons and Big Stone gaps. The 

 sandstone of Penningtons gap and of Harlan county, which belongs in 

 the interval above the " Tacoma " coal bed of eastern Wise and western 

 Russell, from 325 to 375 feet above the Rockcastle (" Bee rock "), is the 

 Corbin of Campbell and the Sharon sandstone of Pennsylvania and 

 Ohio. It is of interest to note that this interval has shown little change 

 for more than 100 miles along the eastern outcrop. The Bonair and 

 Etna (Cliff) are distinct in Penningtons gap, but they are not separate in 

 the Big Stone Gap section. The Gladeville sandstone, 800 to 900 feet 

 above the Sharon (Corbin), is the great sandstone underlying the Ken- 

 tucky Coal 4, the Hunnewell cannel, and the Tionesta of Ohio and Penn- 

 sylvania. The Imboden coal bed is evidently at the horizon of Bradley's 

 Coal bed O ; the Lower Splint is his Coal bed P, and the interval in 

 western Wise- is practically the same as on Coal creek, the Gladeville 

 sandstone in each locality being about 800 feet above the {Sharon (Cor- 

 bin). There are some additional details which confirm these identifica- 

 tions. It will be remembered that Professor Crandall, in his description 

 of the Pound Gap region, showed a succession very similar to that of the 

 Big Stone Gap area. His provisional section for the Elkhorn region 

 may be compared with that at Big Stone gap : 



Feet. Feet 



1. Fossiliferous limestone 



2. Interval 210 265 



3. Cannel 



4. Interval 150 to 175 21 to 60 



5. Upper Splint 



6. Interval 100 to 130 65 to 100 



7. Lower Splint 



8. Sandstone 120 to 150 120 Gladeville 



9. Coal bed 



10. Interval 15 to 40 111 



11. Elkhorn coal bed .... Kelly 



12. Interval 20 to 40 75 



13. Wright coal bed • Imboden 



with in Kentucky 400 feet and in Virginia 600 feet of shales and sand- 

 stones to the Sharon (Corbin) sandstone, these lower beds containing 

 coal beds, some of which become of workable thickness at various 

 localities. 



Although Professor Crandall is careful to state that his Elkhorn gen- 

 eral section is purely provisional, it suffices to show that the general 

 succession is the same in both localities. Measured sections in neigh- 



