130 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



disappears before reaching Elliott county. The Upper Freeport is seen 

 rarely. In Elliott county the rocks of the Allegheny become coarse, this 

 condition becoming more marked southwardly, so that beyond that county 

 the section above the Vanport horizon can be followed only with extreme 

 difficulty. The Lower and Middle Kittannings should be reached in 

 northeast Breathitt, where the section extends at one locality to 450 feet 

 above the Tionesta coal bed, or to about 350 feet above the place of the 

 Vanport limestone.* 



In Boyd and Lawrence counties, east from the narrow outcrop, the 

 Brookville seems to be persistent. Ordinarily it is thin, but in central 

 Lawrence, near Louisa, it is a mass 10 feet 8 inches thick with this 

 structure : 



Feet. Inches 



Coal 8 



Shale 1 8 



Coal and sandstone 7 



Shaly coal 3 



Impure coal 2 3 



Coal 2 6 



The Kittannings and the Lower Freeport are generally present, but the 

 Upper Freeport is absent in considerable areas. The Butler sandstone 

 is often continuous with the Mahoning above and at times extends down- 

 ward, so as to cut out the LTpper Freeport (First Fossiliferous, Shawnee) 

 limestone. It is quite possible that the absence of the Clarion in so 

 much of Kentucky is due to the upward extension of the Clarion sand- 

 stone. In southern Lawrence the coal beds become uncertain and in 

 some of the sections they seem to be wholly wanting. In much of John- 

 son county, south from Lawrence, the Allegheny has been removed, but 

 it is probable that the whole section is preserved in portions of Martin 

 county, east from Johnson, along the West Virginia line; the tracing, 

 however, is not sufficiently close to make possible the correlation of coal 

 beds. 



Still farther south the conditions become very complex; the coal beds 

 divide, the intervals thicken, and the true relations will be determined 

 only by patient tracing in detail. Correlations offered by Professor 

 Crandall and Mr Hodge as the result of rapid reconnaissance must be 

 accepted, in accordance with their suggestion, as merely tentative. The 



* A. R. Crandall : Geol. Survey of Kentucky, Greenup, Carter, and Boyd counties, pp. 

 22, 33, 49, 53, 59, 63 ; pi. 1, 25 ; fig. 2, 26 ; fig. 1, 31 ; sections 34, 35, 51-52, 56, 58-59, 

 61-62, 69, 78, 82; Elliott county, pp. 10, 11-13; Morgan, Johnson, and MagoflSn, p. 17. 

 J. M. Hodge : Southeastern Kentucky coal fields, p. 107, sections 56, 81, 84-85, 87. 



