It typically slopes down from the base of a steeper retreating desert cliff, or escarpment, but may continue to exist after the mountain has eroded away. Pediment is a very gently sloping (.5°-7°) inclined bedrock surface. 14 Information Geographique, 21, 183–96. Covered pediments carrying a cover of coarse allochthonous detritus largely conform to this model, but are of limited distribution. In geology and geomorphology a pediplain (from the Latin pes, genitive case pedis, meaning "foot") is an extensive plain formed by the coalescence of pediments. From peneplains to pediplains (Twidale and Bourne, 2013), to pediments (Twidale, 2014), to various avatars of the etchplain concept (Thomas, 1989) and … Text book examples of rocky deserts (hamada) with pediments and pediplains (coalesced pediments) occur in bedrock areas without sand sea or yardangs. On the other hand, the fraction of the total surface area occupied by pediments in a specific desert zone also may have great variability. Reported on six continents, their distribution spans the range of subpolar latitudes from the Arctic to the Antarctic and the range of climate from hyperarid to humid tropical (Whitaker 1979). Pediments, gently sloping erosional surfaces of low relief developed on bedrock, occur in a wide variety of lithologic, neotectonic, and climatic settings. We The processes through which pediplains forms is known as pediplanation. Because genetic implications are so often associated with various names, it seems best to … Revue de Geomorphologie Dynamique 20, 71–8. Abstract: The Thar Desert is a part of the arid zone of north-western India. Residual pediments also have been found in the Brazilian rain forest at the foot of the Serra do Mar. Pediments present a variable surface area, ranging between 2.5 and 650 km 2 in the Desert of Sonora in Arizona. The concepts of pediplain and pediplanation were first developed by geologist Lester Charles King in his 1942 book South African Scenery. The past geomorphic processes on its territory triggered by orogenesis and climate change generated a diversity of landforms, including structural (volcanic dykes, orogenic ridges, hamadas), denudational (pediplains, pediments, desert pave- Desert Knolls pediment and associated landforms in the Mojave Desert, California. The more common mantled and rock … CrossRef Google Scholar. [rock-cut pediments], though widely regarded as desert and semi-desert forms, are in fact widely distributed … Covered pediments are found in Colorado, Utah and Alaska, in Korea and Japan, as well as arid and semi-arid regions. 13. This literature has provided a wealth of information on the form of pediments and the settings in which they are found. Google Scholar. The most comprehensive review of pediments as a desert landform concluded: There is a large literature on pediments. Pediments have been regarded as smooth, gently inclined, surfaces that front receding escarpments, are epigene forms shaped by running water, and are well represented in arid and semi-arid lands. Pediments are flat but gently sloping erosional landforms cut across the geological structure. Planation surface, any low-relief plain cutting across varied rocks and structures. They are crossed by channels of intermittent streams ... Pediments et glacis d’erosion, pediplains et inselbergs. Pediments/pediplains are therefore not proxies of uplift and their preservation over geo- logical timescales typifies regions submitted to < 10 m/My erosion rates. Among the most common landscapes on Earth, planation surfaces include pediments, pediplains, etchplains, and peneplains.There has been much scientific controversy over the origins of such surfaces.
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