Abstract
The coloration of the Moon in light and dark areas requires a remarkably specific interpretation and is therefore a good starting point for the discussion of processes on the lunar surface. It is generally true that the high ground is light and the low flat ground is dark. Generally the ray material ejected from craters both in the high and the low ground is light (there are a few exceptions). The light ray material is present only in association with craters judged youngest on all other evidence, and it must therefore be supposed that such ray material does not show on the surface for long, compared with the age of most features.

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