﻿NO. lO 



SMITHSONIAN EXPLORATIONS, I923 



lu,. 12. — \ icw of Middle Urdovician-Mississippiaii uuconfurmity near 

 Hollow Springs, Tennessee, showing the undnlating line of contact between 

 the Cannon limestone (C) and the Chattanooga black shale (B). (Photo- 

 graph by Bassler. ) 



Fig. 13. — View of Highland Rim in e?,st central Tennessee, dissected by 

 Central Basin stream. (Photograph by Bassler.) 



