nounGeology , dated
An idealized course of landscape evolution, passing from youthful stages, marked by steep gradients, to old age, when the landscape is reduced to a peneplain.
- In view of the geological cycles of erosion, subduction, and land uplift, this process could continue for a billion years with no appreciable reduction of the uranium concentration in seawater and hence no increase in extraction costs.
- Geomorphologists explained landscapes in terms of cycles of erosion and successions of erosion surfaces or partial erosion surfaces.
- A two-stage cycle of erosion, sediment transport and deposition can explain both the long residence times, and the inverse relationship between sediment age and detrital white mica age.
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