Re: Life on Mars?

David Campbell (
Thu, 15 Aug 1996 19:58:56 -0500

>1) the objects believed to be microfossils in the Martian rock are 100
>times smaller than similar structures we interpret as fossilized bacteria
>here on earth. Thus, since we don't find microbes this small on earth, it
>is hard to see how life on Mars, which came from earth could be so
Robert Folk (of sedimentary rock classification fame) has recently promoted
the idea that many sedimentary rock structures were produced by tiny (by
bacteria standards) bacteria. I think there's some evidence for modern
bacteria in this size range, but some "bacterial structures" in rocks
aren't-for example, someone showed that gold treated with acids has a
surface sculpture just like supposedly bacterially deposited gold.