J. D. Dana on American Geological History, 321 
rock above the Carboniferous. 
% What better evidence could we have than the history of the 
oscillations of the surface from the earliest Silurian to the close 
__ of the Carboniferous Age, and the final cresting of the series in 
eats, 
% 
8 
this Appalachian revolution, that the great features of the con- 
verved in N 
ing that, although the course of the great Azoic lands was partly 
east and west, the same system of Giycikicton that characterized 
ing ages was then to some extent apparent, : 
_ The first event in the records after the Appalachian revolution, 
Was the gathering up of the sands and rolled fragments of the 
¢ 
i b sw 
AN ak ats 
Pah 
F 
rocks and schists along the Atlantic border into 
beds; not over the whole surface, but in certain valleys, which 
lie parallel with the Appalachian chain, and which were evi- 
i of | fing of that revolution. The beds are 
the red sandstones and shales, which stretch on for one hundred 
SECOND SERIES, VOL. XII, NO. 66.—NOV., 1956. ‘ 
41 : 
* 
