126 Hayes and Campbell—Appalachian Geomorphology. 
greatly strengthened. On the Atlantic slope the data are not so 
complete. Almost all of the sediments were derived directly 
from the granitic rocks of the piedmont plain, and hence show 
less differentiation in character than the rocks of the Gulf coast. 
So far as known there is nothing in the character of the Atlantic 
coastal plain sediments which will conflict with the conclusions 
giver above, but exact correlations cannot at present be made. 
Thus the same history of the province which was read in the 
forms of the land surface and in the location of the streams is 
also found recorded in the sediments derived from its erosion. 
The three lines of investigation outlined at the beginning of this 
paper are found to lead to harmonious results and each to sup- 
plement the others. While many details remain to be worked 
out, the main features of post-Paleozoic history of the southern 
Appalachians as given above seem fairly well determined. 
Unitep States GEOLOGICAL SURVEY, 
. ; Washington, D. C. 
