中文摘要：

南岭及其相邻最高山地多保持在接近海拔2000m的高度，大部分山地顶部夷平面已荡然无存，只有少数山岭的顶部还残留着原始夷平面．这些残留的夷平面曾相互连为一体，暗示我国东南部广大地区在晚近地质时期曾一度处于准平原状态．这个古老的原始夷平面形成于渐新世末，即喜马拉雅运动第一幕——冈底斯运动之后的地壳长期稳定时期，与青藏高原山顶夷平面以及华北北台期夷平面形成时间相当．说明中国大陆各部虽相距遥远，甚至处于不同的板块和构造体系，但在渐新世末却处于统一的准平原状态，大范围长尺度造山运动的脉搏似乎是一致的．

英文摘要：

Abstract： The Nanling Mountains and their adja- cent highlands mostly have an approximate altitude of 2000 m, where the top planation surfaces are still remained on some summits. These planation surfaces joined once each other imply that the vast southeastern part of China was in a state of peneplain during late geological period. The data from sediments, tectonic and erosion rate show that this original peneplain was formed in the end of the Oligoeene Epoch, a long crust steady phase after the first episode of Himalaya tectonic movement. These planation surfaces are comparable with the summit planation surfaces of the mountains on the Tibetan Plateau and in the Beitai episode in Northern China, probably implying that they were united peneplain during the end of the Oligocene Epoch, although they are far from each other and are even located in different plates and tectonic systems.