Search results
Results from the WOW.Com Content Network
The result is that the surface is eroded chiefly backward and that downward erosion is limited. [1] [3] In contrast to common peneplain conceptualizations several pediplains might form simultaneously at different altitudes and do not necessarily grade to a base level. [2] Pediplains are normally formed in areas of arid and semi-arid climate. [5]
Erosional surfaces within the stratigraphic record are known as unconformities, but not all unconformities are buried erosion surfaces. Erosion surfaces vary in scale and can be formed on a mountain range or a rock. [2] Particularly large and flat erosion surfaces receive the names of peneplain, paleoplain, planation surface or pediplain. An ...
Paleoplain - A buried erosion plain; a particularly large and flat erosion surface; Pediment – Very gently sloping inclined bedrock surface; Pediplain – Extensive plain formed by the coalescence of pediments; Peneplain – Low-relief plain formed by protracted erosion; Planation surface – Large-scale land surface that is almost flat
Pediment surface at base of Book Cliffs, Utah A pediment , also known as a concave slope or waning slope , [ 1 ] is a very gently sloping (0.5°–7°) inclined bedrock surface. [ 2 ] It is typically a concave surface sloping down from the base of a steeper retreating desert cliff , escarpment , [ 3 ] or surrounding a monadnock or inselberg ...
In geology and geomorphology a planation surface is a large-scale land surface that is almost flat with the possible exception of some residual hills. The processes that form planation surfaces are labelled collectively planation and are exogenic (chiefly erosion). Planation surfaces are planated regardless of bedrock structures. [1]
Shield relief, including peneplains, can be protected from erosion by various means. [5] [7] Shield surfaces exposed to sub-tropical and tropical climate for long enough time can end up being silicified, becoming hard and extremely difficult to erode. [7] Erosion of peneplains by glaciers in shield regions is limited.
The geographic cycle, or cycle of erosion, is an idealized model that explains the development of relief in landscapes. [1] The model starts with the erosion that follows uplift of land above a base level and ends, if conditions allow, in the formation of a peneplain . [ 1 ]
For glacier erosion to be effective in shields a long "preparation period" of weathering under non-glacial conditions may be a requirement. [17] Silicification of peneplain surfaces exposed to sub-tropical and tropical climate for long enough time can protect them from erosion. [17]