KENTUCKY 101 



tically unrepresented north from Scioto county in Ohio. We have seen 

 the Sharon sandstone dividing into a coarse upper plate and less coarse 

 lower plate, separated by coal-bearing shale, while farther south the 

 upper plate undergoes further subdivision ; but we have seen, following 

 the mass southward, that instead of thinning, as at the north, toward the 

 central line of the basin, it thickens in that direction, meanwhile grow- 

 ing coarser, so that near the Tennessee line it is a mass of sandstones 

 separated by coal bearing shales in all not less than 450 feet thick and 

 possibly much more. 



We have seen also the coal horizon of the Jackson Shaft bed remain- 

 ing comparatively unimportant until Menifee county was reached; but 

 there the sub-Sharon shales expand and new coal horizons are shown, 

 while farther south coal beds make their appearance in the Sharon 

 sandstone itself, occupying places such as do the coal blossoms spoken 

 of as occurring within northwestern Jackson county of Ohio. One is 

 led to suggest that these may represent periods when isolated marshes 

 along the western shore of the basin were filling with coal deposits; so 

 that while those deposits were not continuous they may have been 

 practically synchronous. In southern Kentucky favorable conditions 

 lasted long enough for the accumulation of important beds, as was 

 the case also in Tennessee. 



Before studying the section above the Sharon sandstone in south- 

 eastern Kentucky, where it has been described so well by Professor 

 Crandall, it is well to return to the north, in order to take up counties 

 east from those already examined, that the section may be carried 

 southward with certainty, for variations occur in the Upper Pottsville 

 very similar to those already observed in the Lower. At the same time 

 the variations of the Low T er Pottsville will be considered as they are 

 shown by sections obtained where that portion of the series has been 

 brought up by faults or folds. 



The Sharon, Quakertown, Mercer, and Tionesta coal beds have been 

 followed across Greenup, Carter, and Elliott counties into Morgan, where 

 the succession is clear. 



The whole of the Pottsville is below drainage in Boyd county, lying 

 between Greenup and the West Virginia line, as well as in much of 

 Lawrence south from Boyd ; but in western Lawrence the succession is 

 very clear over to Blaine creek, for an anticline rising in central Lawrence 

 and passing southwest into Johnson county brings up the Sharon sand- 

 stone in deep valleys of both counties. 



The Ferriferous limestone is the lowest bed exposed on Dry fork of 

 Little Sandy, in the southeast corner of Carter county ; but thence the 



XIV— Bull. Geol. Soc. Am., Vol. 15, 1903 



