228 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Topographic Features of the Tallulah District. 
' The accompanying diagram (fig. 5) will serve to illustrate the more 
salient topographic features of The Tallulah district. It is at once 
apparent that those features may be grouped under the following 
heads:— 
(1) The lower peneplain level upon which the Tugaloo River 
has its open valley, and which may for convenience be called the 
Tugaloo level. 
(2) The upper peneplain level, upon which the headwaters of the 
Chattahoochee River have their open valleys, and which may be 
called the Chattahoochee level. 
(3) The marked escarpment, about 500 feet in height, joining the 
western edge of the lower, Tugaloo level, to the eastern edge of the 
higher, Chattahoochee level, and locally known as the Chattahoochee 
or Chattooga Ridge. As this topographic feature was originally an 
escarpment rather than a ridge, and has only assumed the appearance 
