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masher_oz t1_ixxtjr3 wrote

Reply to comment by skribe in When prehistoric land masses are depicted, what is the accuracy to which they are drawn. Would the maps produced be useful for navigating that world? by TheRealPopcornMaker

Looks like longer than 0.5 Ga ago, there's less oxygen in the atmosphere than there is now.

https://en.m.wikipedia.org/wiki/File:Oxygenation-atm-2.svg

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skribe t1_ixxuzmq wrote

Isn't that what I just said?

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imVision t1_ixz7s2b wrote

OK, but you’d need to bring in like a suit full of oxygen because the atmosphere only contained about 20% of the oxygen that today’s atmosphere has

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