古代侵蚀是根据土壤侵蚀发生的时间进行划分的。以人类在地球上出现的时间为分界点，将土壤侵蚀分为古代侵蚀和现代侵蚀。
粘土沉积分布在古代的火山表面和坑坑洼洼的高原地区，其中一些显然是最近才由于侵蚀而暴露出来的。
The clay deposits are scattered all over, in ancient volcanic surfaces and heavily cratered highland regions, some of which have apparently been exposed by erosion only recently.
山是古代受侵蚀海底的遗作，上载着秀美竹林和水稻梯田。
The mountains are vestiges of ancient eroded seabeds that support graceful bamboo groves and terraced rice paddies.
证据显示，撒哈拉的古代海洋和河流中，砂岩小尖塔被降雨侵蚀。
Evidence of the Sahara's ancient seas and rivers, sandstone pinnacles were eroded by rainfall.
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