And, where those cannot be achieved, at least a base-level opposition to tyranny, reaction, religious fundamentalism, and so on.
A peneplain, therefore, is a surface which has been brought toward, but not to base-level.
At a stage shortly preceding the base-level stage the surface would be a peneplain.
The excavation of these valleys is due to an upheaval which raised this part of the Pampa above the base-level.
The base-level is now 2-2, and the valley represented in the diagram has not yet reached it.
It is indeed one of the best examples of a base-level plain to be found on the continent.
It is possible that these crests are remnants of a base-level plain older than that referred to above.
No definite degree of slope can be fixed upon as marking a base-level.
In addition to the "castle" rocks and base-level plain about Camp Douglas, other features should be mentioned.
In the base-level plain are found "old-age" valleys, broad and shallow, with the stream meandering in a wide flood-plain.