200 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



terval between the beds varies from 10 to 30 feet and the Anderson coal 

 seems to be present generally; the coal Number 13 is from 28 to 50 feet 

 below the Anderson. The Mahoning interval at times increases to 10 

 feet. In this part of the county the Cambridge is about 260 feet above 

 the Vanport (Ferriferous) limestone. 



The Cambridge limestone is very persistent and appears in many of 

 the sections measured by Andrews and Gilbert in various parts of the 

 county, sometimes single, sometimes double, the upper division separated 

 from the Anderson coal bed by black shale. It is 230 feet above the 

 Vanport (Ferriferous) limestone, on the Ohio river at about 3 miles 

 below Ironton, the only direct measurement obtained along the river. 

 At 7 miles north from Catlettsburg, Kentucky, the Upper Cambridge is 

 12 feet above the Anderson coal bed and 120 above the Upper Freeport.. 

 Measurements along the river or within 3 or 5 miles west or north from 

 it are wanting, as the rocks are mostly soft and the slope rises in benches 

 covered by loose material so deep as to mask everything.* 



KENTUCKY- 



Passing over into Kentucky, one finds Professor Crandall's generalized 

 section for the northeastern counties as follows : 



Feet 



1. Greenish sandstone and shale 60 



2. Impure limestone [Ames ( ?) ] 



3. Concealed 16 



4. Coal bed 12 [Harlem ( ?) ] 



5. Sandstone and Ore 55 



6. Impure limestone [Upper Cambridge] 



7. Sandstone and shale 21 



8. Coal bed 11 [Anderson] 



9. Sandstone or shale 39 



10. Ore and Second Fossiliferous limestone [Lower Cam- 



bridge] 



11. Coal 10 



12. Sandstone, some shale [Buffalo and Mahoning] 60 



13. Coal bed 9 [Upper Freeport] 



but the intervals vary greatly from those given in this section. 



The Upper Freeport coal bed is absent from much of the area. Only 

 the lowest members of the formation reach into Greenup county and the 

 western outcrop passes through western Boyd and eastern Carte':; the 

 highest beds are reached in Lawrence county. 



* E. McMillin : Vol. v, p. 122. This section as published by Professor Orton has 

 been modified in accordance with Mr McMillin's notes. 

 E. B. Andrews : Report for 1870, pp. 195, 204, 207. 



