Suppose, for instance, that there has been an epoch of

elevation, that mountain chains have been lifted far into the
sky and volcanoes have sent their floods of lava forth, and
fault-scarped cliffs run across the landscape and that then,
for a while, the forces of elevation cease their work
Suppose, for instance, that there has been an epoch of
elevation, that mountain chains have been lifted far into the
sky and volcanoes have sent their floods of lava forth, and
fault-scarped cliffs run across the landscape and that then,
for a while, the forces of elevation cease their work. Little
by little, the mountains will be worn down to a surface of less
and less relief, approaching a plain as a hyperbola approaches
its asymptote--a surface which W. M. Davis has called
peneplain.


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