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a. The stage in the development of a stream at which erosion is decreasing
in vigor and efficiency, and aggradation becomes dominant as the gradient
is reduced. It is characterized by a broad open valley with a flood plain
that may be 15 times the width of the meander belt; numerous oxbows,
bayous, and swamps; a sluggish current; and slow erosion, effected chiefly
by mass-wasting at valley sides. AGI
b. The final stage of the cycle of erosion of a landscape or region, in
which the surface has been reduced almost to base level and the landforms
are marked by simplicity of form and subdued relief. It is characterized
by a few large meandering streams flowing sluggishly across broad flood
plains, separated by faintly swelling hills, and having dendritic
distributaries; and by peneplanation. AGI
c. A hypothetical stage in the development of a coast, characterized by a
wide wave-cut platform, a faintly sloping sea cliff pushed far inland, and
a coastal region approaching peneplanation. The stage is probably a
theoretical abstraction, since it is doubtful whether stability of sea
level is maintained long enough for the land to be so reduced. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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