Approximately 468 million years ago there were a large number of L-chondrite meteorites falling to Earth. This is called the Ordovician meteor event and was probably the result of a large collision in the asteroid belt.

Does the lunar cratering record also show evidence of this event?

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    $\begingroup$ Can't find (quick skim) any papers on lunar Ordo. I suspect that's due to lack of collecting samples from the far side of the moon, since it is statistically impossible for this meteor cluster to have missed the moon entirely. $\endgroup$ – Carl Witthoft Feb 6 at 13:46

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