The levelling of a landscape by erosion.
- These profiles show evidence for planation at the top of the Outer Plains close to the Inner SDR.
- Anglo-American geomorphologists tend to the view that pediments are the result of either lateral planation by ephemeral, migrating streams issuing from bordering mountains, or sheet-flood erosion.
- Indications of planation near the Inner SDR might either indicate that this unit formed partly under subaerial conditions (subaerial seafloor spreading) or that an uplift episode occurred after its emplacement.
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