?底形
... bedformsuperimposition底形叠加作用 bedform底形 bedgeometricfactor地层几何因子 ...
砂质底形
稳定形态
河床地形
If you look at the pictures of Shaler taken by Curiosity, you can see how subsequent erosion has taken its toll on this preserved bedform.
BBC: Curiosity Mars rover to investigate classic rock type
bedform:
bed +? form
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