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Re: Martian fossils (Martiobiota)





David,
Supposedly they have ruled out contamination since these were in the interior of the meteorite, and it was found in a relatively pristine environment (Antarctic ice sheet). But I guess it is hard to rule out contamination 100%.
As for rocks carrying life from Mars to Earth (or vice versa), the probabilities are undoubtedly miniscule compared to the probabilities that life evolved separately on the two planets. If martiobionts managed to survive the interplanetary trip, they would have been overwhelmed by the geobionts already in place on Earth.
Martiobiota and Geobiota are probably chemically related, with similar organic chemistries, but IMHO they would be genetically independent. It would be interesting to see just how similar their "amino acids" are and especially if they are predominantly levorotary as on Earth, or dextrorotary. That's assuming they reached a "protein" stage and didn't get stuck at the a primitive "RNA" stage.
I would say a geobiont (pl. geobionts) is a member of Geobiota. And Martiobiota is likewise composed of martiobionts. But I'm no Greek scholar. I also prefer the spelling Protista rather than "Protoctista" (thank goodness the latter name hasn't caught on).
------Ken Kinman
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From: "David Marjanovic" <david.marjanovic@gmx.at>
Reply-To: david.marjanovic@gmx.at
To: "The Dinosaur Mailing List" <dinosaur@usc.edu>
Subject: Re: Martian fossils (Martiobiota)
Date: Fri, 2 Mar 2001 22:59:44 +0100


----- Original Message ----- From: "Ken Kinman" <kinman@hotmail.com> To: <dinosaur@usc.edu> Sent: Friday, March 02, 2001 12:11 AM Subject: Martian fossils (Martiobiota)


>
> Dear All,
> Additional evidence has been published showing that Martian microbial
> life did exist on Mars long ago (who knows, they may still exist in its
> nooks and crannies).
> Although none of these fossils has been given a genus or species name
> (understandably), they can be classified in Cosmogenre Martiobiota (a name
> which I proposed in 1996 in Journal of MetaBioSystematics).
> However, there is no reason to assume that they are genetically
related
> to Earth life (Cosmogenre Geobiota), their magnetotatic similarities being
> most likely convergent. But I'm sure the "panspermia" believers will
think
> otherwise. So it goes. There is a link below for those interested in
> extraterrestrial fossils.
> ----Ken Kinman
> http://science.nasa.gov/headlines/y2001/ast28feb_1.htm


Magnetosomes are great evidence for life, I'd say, but not evidence against
contamination from Earth...
Anyway, though panspermia is too much to buy for me, it is very plausible
that Earth and Mars exchanged lots of rocks during heavy bombardment times,
so IMHO there is "reason to assume that they are genetically related to
Earth life" if THEY exist(ed).

Same problem here as with dinosaurs -- the old sayer "give me more
fossils!!!".

BTW, does anyone here know enough classical Greek to be able to tell me
whether it should be -biota or -bionta?

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