Further Tests for Randomness of Lunar Craters

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Abstract
Interpretation of the usual tests for randomness of craters on the southern floor of Ptolemaeus, applied to the distribution of centres of craters smaller than 4 km in diameter, is facilitated by virtue of the negligible effects of obliteration in this region. Distance tests of randomness show that the craters are definitely clustered, and are thus unlikely to be of primary impact origin. Significant values of the index of dispersion of thin strip counts are used to single out any preferred alignments of craters. Preferred trends are found, and it is shown that the majority of the craters forming the chains are of internal, rather than of secondary impact, origin.

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