paleosol

例句：

1. 1. The ancient city was buried under layers of paleosoils.
   这个古城被厚厚的古土壤层所覆盖。
2. 2. Paleosols are an important source of information about the past climate.
   古土壤层是研究过去气候的重要信息来源。
3. 3. The team excavated a section of paleosoils to study their composition.
   该团队挖掘了一段古土壤层，以研究其成分。