424 A. r. FOERSTE — LIMESTONES OF TENNESSEE AND KENTUCKY 



near Salt Lick, along the Licking river, is in the horizon of the Clinton 

 limestone and the immediately overlying Osgood rock. 



Devonian Formations 

 devonian limestone absent along cumberland river, kentucky 



The Devonian limestone is absent along the Cumberland river, and 

 for some distance northward in central Kentucky. 



The most southern outcrops of the Devonian rock in Kentucky ex- 

 tend to within about 10 miles of the westward course of the Green 

 river across the crest of the Cincinnati anticline (figures 6 and 8). 



Figure 8. — Southern Limit of Devonian Limestone. 



This sketch map shows the approximate southern boundary of the Devonian limestone in the 

 region of tlie Cincinnati anticline, in central Kentucky. 



It is absent north and nortlieast of Liberty and along the valley of the 

 Cumberland river in Kentucky. It is probably absent also along that 

 part of the Cumberland river which passes through Tennessee, although 

 this region has not been investigated east of Lafayette. A doubtful rock 

 occurs at the S. R. Wood locality (figure 1, locality 2) w^est of Lafayette, 

 and 10 miles north of Hartsville. The base of the fissile Black shale 

 is here underlaid by 6 to 16 inches of dark, earthy rock. The upper 

 half of this rock is phosphatic, and the lower half includes numerous 

 fragments of silicified brachiopods and crinoid stems. Crinoidal ma- 

 terial occurs also at the base of the Black shale at the Gap of the Ridge, 

 less than two miles eastward. Since it was impossible to determine the 

 specific identity of any of this fossiliferous material it is impossible to 



