Half-life of DNS bondings is about 10k years.

You just saved the franchise.

the BS about DNA preserved in ambar was just storytime BS, Michael Crichton himself repeatedly told people the same thing: that he'd made it up as plausible sounding technobabble. But it was BS because of a hard limit to the longevity of DNA in any fossilized context.

Material blasted from the earth maybe including a few animal parts isn't nearly so rigidly improbable, or impossible. We know that massive amounts of ejecta went far into space, and a lot almost certainly slammed into the moon.