Subaerial erosion occurs often with reduction to a peneplain . 陆上侵蚀常夷平成准平原。
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Ancient peneplained surface is dissected by irregular steep sided valleys . 古准平原化地形被不规则的峻峭的山谷所切割。
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A nearly flat land surface representing an advanced stage of erosion 准平原一种因晚期侵蚀作用而形成的近似平坦的地面
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Intersecting peneplain morvan 交切准平原
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Base level peneplain 基面准平原
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There are lowering and backing of the ground when it was planated . planation can be classified into many types such as peneplaination , pedimentation , cryoplanation and double leveling surfaces planation 夷平作用大致可分为准平原化夷平作用、山足夷平作用、冻融夷平作用和双层水平面夷平作用等几种类型。
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According to whether there are later tectonic activities or not it can be divided into mountain planation surface , lower planation surface and buried planation surface . according to active condition , it can be divided into active surface , dormant surface , exotic surface and defunct surface . taking the base level into consideration , it can be divided into sea - eroded and deposited planation surface , denudated planation surface , snowline planation surface and upper eroded planation surface 依据夷平面形成后是否遭到后期构造变动将夷平面分为山地夷平面、原地夷平面和埋藏夷平面；依据夷平面的活动状态可分为活动面、休眠面、外来面和废止面；依据侵蚀基准面可分为海蚀-堆积夷平面、剥蚀夷平面、雪线夷平面和上部剥蚀夷平面；依据基底可分为稳定地带上的夷平面和活动地带上的夷平面；依据气候带可分为准平原、山麓面和联合山麓面、双层水平面和刻蚀平原、冻融山足面和冻融剥夷平原。
