Newly discovered biomarker signatures point to a whole range of previously unknown organisms that dominated complex life on Earth about a billion years ago. They differed from complex eukaryotic life as we know it, such as animals, plants, and algae in their cell structure and likely metabolism, which was adapted to a world that had far less oxygen in the atmosphere than today. An international team of researchers, including GFZ geochemist Christian Hallmann, now reports on this breakthrough for the field of evolutionary geobiology in the journal Nature.
So awesome, I read science articles like this and just a slew of writing ideas comes bubbling out. Hard not to think of ancient eldritch creatures that were here long before us.
It’ll be interesting to see what else they can find out about this ancient form of life, looking forward to updates.
There’s also the ‘dark ecosystem’ concept, where those ancient life forms evolved on a parallel but separate track from ours and survived by virtue of being functionally invisible to us.
Never heard of that because but that’s a really fun concept, I’ll have to look up more info on the dark ecosystem!
‘Shadow biosphere’ is another term for it. Here’s a brief primer on the possibility: https://earthsky.org/earth/invisible-alien-life-exist-among-us-silicon-based/
It’s tempting from a worldbuilding standpoint to extrapolate from that to a full-fledged parallel civilization just out of phase with ours.
