This is interesting and important but fun fact, maybe not the first case of 2 billion+ yr old microbes. There were microbial organisms found in a mine in Minnesota coming from 2.6 billion year old rock and they suspected they were coming from water trapped when the rock, banded iron formation, formed in an ancient ocean. IIRC there were two bacteria - one that eats sulfur and excretes iron, and one that eats iron and excretes sulfur.

Soudan Mine in northern Minnesota. Great tour.

https://www.twincities.com/2008/12/22/soudan-mine-studied-for-bacterial-life/

[–] rickyrigatoni@lemm.ee 43 points 2 years ago (3 children)

imagine two societies spending billions of years in the dark depths eating the others poop

nature is beautiful

[–] stupidcasey@lemmy.world 12 points 2 years ago

It’s as though the yin and yang are just a black turd and a white turd clumped together…. Beautiful.

[–] londos@lemmy.world 10 points 2 years ago

))<>((

[–] HulkSmashBurgers@lemmy.world 5 points 2 years ago

The dirty ourobouros.

[–] booly@sh.itjust.works 3 points 2 years ago (1 children)

one that eats sulfur and excretes iron, and one that eats iron and excretes sulfur

Thermodynamically, how could these two cycles sustain metabolism? Were there other processes/species in the mix to introduce chemical compounds that had more energy contained within?

[–] weariedfae@lemmy.world 3 points 2 years ago* (last edited 2 years ago)

I don't recall as it was mentioned by someone in passing (and stuck with me) but I can tell you that the rocks they were in are exceptionally iron rich, which is why the mine was there.

[–] Hugin@lemmy.world 2 points 2 years ago

Reminds me of the primordial soup game where each players microbes need to eat to the poop of the other players. And yes it's a German game.

https://en.m.wikipedia.org/wiki/Primordial_Soup_(board_game)

[–] Flocklesscrow@lemm.ee 1 points 2 years ago

So the two bacteria just eating each other's excretions in symbiotic romance?