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In geomorphology and geology a peneplain is a low-relief non-constructional plain. This is the definition in the broadest of terms, albeit with frequency the usage of peneplain is meant to imply the representation of a near-final (or penultimate) stage of fluvial erosion during times of extended tectonic stability.〔 Peneplains are sometimes associated with the cycle of erosion theory of William Morris Davis.〔 The existence of some peneplains, and peneplanation as a geomorphological process, is not without controversy, due to a lack of contemporary examples and uncertainty in identifying relic examples.〔(Phillips, Jonathan D. (2002), "Erosion, isostatic response, and the missing peneplains" ), ''Geomorphology'', Vol. 45, No. 3-4. (Elsevier ), 15 June 2002, pp. 225-241. .〕 By some definitions peneplains grade down to a base level represented by sea level, yet in other definitions such a condition is ignored.〔 A common misconception about peneplains is that they ought to be featureless.〔 ==See also== *Erosion surface *Planation surface *South Småland peneplain *Sub-Cambrian peneplain *Summit accordance 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「peneplain」の詳細全文を読む スポンサード リンク
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