前者以>50米厚的风化剖面为特征，后者则是连接分水岭与河流的侵蚀-搬运斜坡。铁质硬壳（duricrust）的时空分布成为解码古气候的关键指标。 靶区与方法 布基纳法索Goren绿岩带因其完整的风化层序列成为西非形态-成土作用（morpho-pedogenesis）研究的理想靶区。

The duricrust soil is covered by one to two centimetres of Martian dust and sand, with a layer of volcanic sand and debris below. On the right, the filled pit, traces from the lander's gripper arm can ...