682 



A. F. FOERSTE 



the Headwaters of Indian Creek, but is present along the head- 

 waters of Horse Creek. The chief difficulty encountered in 

 attempting to trace the eastern line of outcrop of the Linden 

 bed is the absence of exposures at the proper horizon in most of 

 the territory contiguous to the Tennessee River, due to removal 

 of the upper part of the Silurian section and of the overlying 



1 Black 

 S Shale 



Brownsport 

 Bed 



Dixon Bed 



Fig. S.— Bluff at Rise Mill. 



paleozoic rocks by Cretaceous and Tertiary erosion. At most 

 localities within this territory the Silurian rocks are directly 

 overlaid by the Coffee sand or by the iron bearing gravels of 

 Professor Safford. 



The Linden limestone is well exposed at the Calybeate Spring 

 on Horse Creek. Over a mile south of Maddox store, a road 

 leaves the Florence road and passes through the woods eastward 

 to the Sulphur Spring. Skirting the northern side of a large 

 corn field, it crosses Horse Creek and follows the eastern bank 

 for more than a mile, during the latter part of the distance along 



