double planation In tropical areas, weathering below the surface at the basal weathering front is one level of planation, whereas on the land surface weathered material can be modified by wind and water processes and this provides a second level of planation. Climate and local conditions determine the relative rates of development of these two levels of planation, and they can contribute to the production of an etchplain.

double planation The development of two erosion surfaces, one below the surface produced by weathering, the other at the surface produced by wind and water erosion. The phenomenon occurs in tropical areas and its rate of development is determined by climate and local conditions. It can contribute to the production of an etchplain.