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From: RonO <rokimoto557@gmail.com>
Newsgroups: talk.origins
Subject: Re: 2-billion-year-old rock home to living microbes
Date: Mon, 7 Oct 2024 08:44:46 -0500
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On 10/7/2024 12:15 AM, Pro Plyd wrote:
> 
> https://www.sciencedaily.com/releases/2024/10/241003123543.htm
> 
> Pockets of microbes have been found living within
>   a sealed fracture in 2-billion-year-old rock. The
> rock was excavated from the Bushveld Igneous
> Complex in South Africa, an area known for its
> rich ore deposits. This is the oldest example of
> living microbes being found within ancient rock so
> far discovered. The team involved in the study built
> on its previous work to perfect a technique involving
> three types of imaging -- infrared spectroscopy,
> electron microscopy and fluorescent microscopy --
> to confirm that the microbes were indigenous to the
> ancient core sample and not caused by contamination
> during the retrieval and study process. Research on
> these microbes could help us better understand the
> very early evolution of life, as well as the search
> for extraterrestrial life in similarly aged rock
> samples brought back from Mars.
> 

I posted on this Oct 4th, but it never showed up.

Repost:
https://www.sciencedaily.com/releases/2024/10/241003123543.htm

The claim is that these bacteria may have been trapped in the rock 
fractures for a very long time.  They could represent some ancient 
lineages of bacteria.  The last paper on the common ancestor of all life 
speculated that this common ancestor evolved after chemotrophes these 
chemotrophes likely evolved the genetic code that the common ancestor of 
extant lifeforms inherited from those ancestors.

https://www.nature.com/articles/s41559-024-02461-1

This paper indicates that our LUCA evolved after the genetic code had 
evolved.  The LUCA may not have been a chemotrophe.  Both Archaea and 
eubacteria have some basic components of photosynthesis, but both also 
have existing chemotrophic lineages.  The issue probably is how much 
horizontal gene transfer has occurred.

If you look at Figure 1 the data indicates that around a billion years 
after the LUCA evolved only two lineages derived from LUCA survived to 
proliferate.  Something severely restricted life on this planet at that 
time, and probably most lineages of life didn't make it.

If the bacteria trapped in the old rock have existed as chemotrophes for 
billions of years they may represent lineages that might add to what we 
currently have.

An alternative that Nyikos may have liked is that space aliens or a 
comet or asteroid may have seeded Archaea and eubacteria onto this 
planet 3.2 billion years ago, and those two lineages had evolved on the 
alien planet a billion years before they came to earth.

Ron Okimoto