CONEMAUGH FORMATION IN KENTUCKY 201 



The Lower Cambridge (Second Fossiliferous) limestone is at 60 to f>8 

 feet above the Upper Freeport coal bed, the greatest interval being in 

 northeastern Boyd and the least in southeastern Carter. The Upper 

 Cambridge (Third Fossiliferous) limestone is 50 to 60 feet above the 

 Lower. Doctor White finds at Catlettsburg a dark fossiliferous lime- 

 stone 160 feet above the Upper Freeport coal bed, evidently the Upper 

 Cambridge, as at a little way southwest Professor Crandall measured .150 

 feet as the interval. Mr McMillin's section in southeastern Ohio gives 

 the interval to Lower Cambridge as 99 feet and that to Upper Cam- 

 bridge as at most 131 feet, with the Anderson coal bed at 15 to io feet 

 above the Lower. The interval between the limestones has almost 

 doubled in 15 miles. Coal bed 10 is present at many places almost 

 directly under the Lower Cambridge limestone; this is a new horizon, 

 apparently without coal in other states, except perhaps in Wayne county 

 of West Virginia. The interval between Upper Freeport coal and 

 Lower Cambridge limestone is frequently filled with sandstone in Boyd 

 county, the upper portion, equivalent to the Buffalo sandstone, being 

 ordinarily very coarse, as in southern Ohio. No representative of the 

 Brush Creek coal is reported anywhere except in southeast Carter, where 

 at one locality a thin coal bed was seen 45 feet above the Upper Freeport 

 and underlying the coarse Buffalo sandstone; it is at the place of the 

 Upper Brush Creek coal bed in Mr McMillin's section. 



In northwestern Lawrence the Lower Cambridge is 70 feet above the 

 Upper Freeport coal bed and 100 feet below the Fourth Fossiliferous 

 limestone, which may be either the Ames or the Ewing limestone, both 

 of which are persistent in southern Ohio. At one point on the East fork 

 of Little Sandy the interval between Lower Cambridge and the Anderson 

 coal bed is 50 feet; the coal is 3 feet 6 inches thick, but elsewhere in 

 Lawrence as well as in Boyd the bed is unimportant. On Jourdans 

 branch the Upper Cambridge, gray, is 50 feet above the Lower and 133 

 feet above the Upper Freeport. At 95 feet above the Lower Cambridge 

 is a cherty limestone, the Fourth, at a short distance above a coal, which 

 is the highest observed in this part of the state and may possibly be at the 

 Harlem horizon. Elsewhere, as may be seen by reference to the general- 

 ized section, the intervals are greater. The highest deposits remaining 

 are near Louisa, in the central part of Lawrence county, where one finds 

 greenish beds above the place of the Fourth limestone. At Louisa the 

 Upper Cambridge is 200 feet above the Lower Freeport coal bed, 190 feet 

 above the Upper Freeport (Shawnee) limestone. The Fourth limestone 

 may disappear as limestone not far south from Louisa. In the north- 

 western part of the county it is a fossiliferous limestone; on Jourdans 



