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Re: dino bones in space - was it a PR thing?
In "Re: dino bones in space - was it a PR thing?", Rick Box asked:
"Do Mars and the moon also have rocks shot out by earth?"
On Oct. 22, 2009, JIMC replied:
"Probability would indicate yes"
Several Precambrian geologists have argued that the only place
that Earth rocks dating back to the Hadean Era and relatively
pristine Early Archean rocks will be found ion either the Moon
or, less likely, Mars.
Something happened on Earth that wiped out any rocks older
than 3.9 billion years on Earth. The only Earth rocks older
than 3.9 million years that would have survived this event
would have been those rocks ejected into space from the Earth
by gigantic impacts.
For example, Harrison et al. (2007) states:
"Discovery of >4 Ga terrestrial rocks on the
Moon: The certainty that the Hadean terrestrial
impactflux was high, coupled with locally
quiescent, post-4.35 Ga thermal conditions in
the lunar near-surface, offers the prospect of
discovering isotopically undisturbed, >4 Ga
terrestrial rock samples in surveys of the
lunar highlands. Alternatively, examination of
the uplifted flank of the South Pole Aitken crater
may reveal a stratigraphic sequence from which
the most ancient strata can be mined. In either
case, the probability of encountering terrestrial
materials during lunar sampling is perhaps as
high as 1:105 ."
Harrison, T. M., B. N. Runnegar, N. J. Woolf, D. J. DePaolo,
R. Walker, A. Pavlov,, 2007, The Oldest Earth and Moon Rocks.
NASA Advisory Council Workshop on Science Associated with
the Lunar Exploration Architecture, White Papers, February 27,
March 2, 2007
Footnote #2 cited above by Harrison et al. (2007) is:
Armstrong, J. C., L. E. Wells, and G. Gonzalez, 2002, Rummaging
through Earth's Attic for Remains of Ancient Life. Icarus. vol. 160,
no.1, pp. 183-196.
They argue that the early remains of Earth, Mars, and Venus have
been preserved on the Moon in high enough concentrations to justify
a search mission.