300 National Geographic Magazine. 



2d. The balds of the Unakas represent the heights of that first- 

 known approach to a base-level. 



3d. The topography of the region has been revived by a gen- 

 eral, though not necessarily uniform, uplift of 3,000 feet or more, 

 divided by two intervals of rest ; during the first of these the 

 Asheville base-level was formed ; during the second, the valley 

 alone was reduced. 



4th. The latest movement of the uplift has been, geologically 

 speaking, quite recent, and the revived streams have accomplished 

 but a small part of their new task. 



These conclusions are reached on the observation of a single 

 class of facts in one district ; they must be compared with the 

 record of continental oscillation on the sea coasts, in the deposits 

 of the coastal plain, and in the topography of other districts. 



The history of the Appalachians is written in every river sys- 

 tem and on every mountain range, but in characters determined 

 for each locality by the local conditions. Only when the knowl- 

 edge, to which every tourist may contribute, is extended over 

 the entire region shall we know conclusively the whole story. 



