94 Hayes and Campbhell—Appalachian Geomorphology. 
descended rapidly toward the south and gradually toward the 
north. The continuation of the axis O P beyond the Ohio river 
is quite uncertain, but it probably extended far into Ohio and 
there may have been within that state a development of the 
fold similar to the one near Chattanooga. 
Besides these axes of elevation there are several along which 
depression occurred during this interval. These depressions 
were not pronounced, but sufficient to vary the altitude of the 
Cretaceous peneplain from 109 to 400 feet. One of these is 
located between and parallel with the axes H Fand G H (plate 
5); another is the axis A B, along which some movement occurred 
at this time; and the third probably connected these, lying east 
of and parallel with the axis O P. There is no evidence in the 
physiography of the region to show when these were active, but 
a careful study of the costal-plain sediments will probably de- 
termine the question. 
Movements in the present Cycle—One of the most pronounced 
movements connected with the close of the Tertiary baseleveling 
was subsidence along the axis A B (plate 6). This, as described 
later, occurred during the deposition of the Lafayette formation. 
After this depression there came a period of apparent quiescence, 
during which no movement is recorded along this line.. In the 
time of the Columbia depression this axis was affected in a 
manner similar to the Lafayette depression. 
Uplift along the axis K LZ (plate 6) occurred soon after the 
general elevation of the land following the Lafayette depression. 
The uplift increased from the Tennessee river in Alabama, reach- 
ing a maximum of 2,600 feet at the Virginia-West Virginia line 
south of New river. From this point it gradually decreased 
northward, passing into Pennsylvania with a probable altitude of 
1,500 feet. As before stated, the northern portion of this uplift 
has been practically continuous, but the southern portion has 
probably been intermittent in its activity. — ; 
Early in the present cycle an uplift occurred along the north- 
ern end of the axis MN, and this seems to have been con- 
nected with movement along the eastern portion of the Hatteras 
“axis. According to McGee, the Hatteras axis, from Roanoke to 
the coast, has been the seat of activity since Eocene time. Its 
influence is shown on plate 6, in the eastward trend of the axis 
M N at its northern extremity and the outward swelling of the 
contour lines. About the middle of the present cycle the uplift 
