Re: [math-fun] Moon as tape recorder for events on Earth

The k-T stuff from Earth has been compromised by later DNA, RNA, microbial stuff. And it wouldn't have been stored in a deep freezer. The stuff that got to the Moon would have been flash-frozen, and if the pieces were in big enough chunks, there could be really well-preserved organic material deep inside the chunks. Ditto for Mars, but there's probably many orders of magnitude more Earth stuff on the Moon than on Mars (even ignoring the fact that the Moon may consist primarily of Earth-stuff). At 12:50 PM 2/19/2015, Marc LeBrun wrote:

[just us]

Compromised how? There's just the usual processes that affect stuff 65M years old (also 64M, 66M etc)--erosive dispersion, oxidation and other chemistry, radioisotope interactions...