File: Otavia_antiqua_3D_reconstruction.jpg (126.9 KB)

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>>5116467
This one supposedly evolved in the Tonian
I remember reading something about phosphate depletion being the main reason oxygen levels and evolutionary innovation were stagnant for so long even after the really early modern-like levels of the early great oxygenation (because dissolved oxygen in the ocean makes iron oxides which sequesters the phosphate which is then trapped under the seafloor forever) and a sustainable high oxygen level only became possible once enough land weathering with rivers and glacial flour and stuff happened to supply a large source of phosphate independent of the seafloor.
I don't know how true this is but if any anons here are experts in that sort of thing plz elucidate

>>5116467
yes

>>5116469
I remember reading that during the Boring Billion they think that the day length plateaued at 19 hours for quite a while due to the sun heating the atmosphere somehow countering the tidal friction of the moon or something, although I'm retarded and couldn't explain to you why that works. I remember them saying that longer days after it ended = more weathering = more oxygenation of seawater and atmosphere like you're saying. The end of the Boring Billion also is theorised to have seen the Earth's mantle cool enough for modern-style "cool" subduction to properly occur. But honestly I really need to take a planetary science course I'm retarded, I wish I knew why people think all this stuff happened. I guess if you made a conclusion from their conclusions though (also factoring in that increased solar luminosity is projected to basically end photosynthesis as we know it by increasing weathering and CO2 pulldown within around a billion years of now) the Earth as a planet has/will be only suitable for complex life for a pretty small fraction of its total existence.

do NOT put your penis in it

>>5117954
>Diskagma buttonii is a small fossil less than 1mm in length found within the surface horizon of a vertisol paleosol above the Hekpoort Basalt dated to 2200 million years old.
If you're willing and able to fuck this thing you have worse things than your sanity to worry about honestly