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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 [2]."

References Cited:

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

http://www.lpi.usra.edu/meetings/LEA/whitepapers/HarrisonLEA_Workshop_Harrison.pdf

http://www.lpi.usra.edu/meetings/LEA/whitepapers/

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.

http://dx.doi.org/10.1006/icar.2002.6957

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.

Yours,

Paul H.