Do not forget that volcanism and liquid water were also once a factor in weathering. There is no life, that we know of, to speed up erosion - so it is possible that drilling only a few cm will reveal geologic history on different timescale than the equivalent depth on Earth.
Granted the top layer, which is all we have studied up until now will be nothing exciting (likely layers of dust deposited over millennia), but unexposed layers have a lot of historic potential. The layers may even be old enough to portr
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/4JnuAYRN7AQ/story01.htm
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