Layers in Spallanzani Crater (extra-detail mgnf)

The layers within Spallanzani Crater are eroding in a stair-stepped pattern.
Each layer appears as a sequence of a broad flat area or plateau, which drops off abruptly down to the next flat surface (see this extra-detail mgnf).

This stair-stepped pattern suggests that the layers have discreet boundaries that may be the result of differing compositions, time of deposition, or both. Near, but not at the edge of each plateau, the material is fracturing into polygonal plates or blocks that tilt downward away from the plateau center.