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a. A stage in the development of a coast that is characterized by
straightening of the shoreline by bridging of bays and cutting back of
headlands so as to produce a smooth, regular shoreline consisting of
sweeping curves; and, eventually, retrogradation of the shore beyond the
bayheads so that it lies against the mainland as a line of eroded cliffs
throughout its course. AGI
b. The extent to which a clastic sediment texturally and compositionally
approaches the ultimate end product to which it is driven by the formative
processes that operate upon it. AGI
c. The stage in the development of a stream at which it has reached its
maximum efficiency, having attained a profile of equilibrium and a
velocity that is just sufficient to carry the sediment delivered to it by
tributaries. AGI
d. The second of the three principal stages of the cycle of erosion in the
topographic development of a landscape or region, intermediate between
youth and old age (or following adolescence), lasting through the period
of greatest diversity of form or maximum topographic differentiation,
during which nearly all the gradation resulting from operation of existing
agents has been accomplished. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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