By the way in reference to the so called 600 year old crater, the high-resolution images from the Terrain Camera on SELENE (Kaguya) show numerous small craters superposed on the ejecta blanket of Giordano Bruno. The size-frequency distribution of these small craters led Morota and colleagues to establish an age of 4 million years for Giordano Bruno
Thanks Nateman. Regarding the GB crater, an estimate from size-frequency distribution estimates based on the bias of no large lunar impacts isn't a refutation, afaic.
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