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but I think it's well-accepted that the primeval atmosphere was anoxic and that free oxygen developed via photosynthesis.

Ie this is the theory the evolutionists like today.

As for extinctions, atmospheric chemistry changes fairly significantly between glacial and interglacial periods without extinguishing life or anything of the sort. This is known from direct measurement of air bubbles trapped in polar ice. Furthermore life has survived numerous cataclysmic impacts and disruptions.

Air bubles in ice prove there are air bubbles in ice. What they prove beyond that is subjective. And life has survived some pretty terrible things. There's just no evidence that life has been through noxious chemical changes in the atmosphere, witnessed GEEs or evolved as result of such change rather than perishing. Moreover, Science can only guess if the planet was ever without an atmosphere or that it was ever other than what it is today with variations on c14. In short, what you are stating as fact is merely theory.

I would throw in a good question about how wooley mammoths could be flash frozen in mid stride such that even the contents of freshly chewed food in the stomache and mouth are undigested and intact. Might also ask how a "polar" climate animal (as evolutionists define them) can eat buttercups, green grass and the like in far northern Siberia. Really puts a nasty wrinkle in things. Buttercups don't grow on frozen tundra. Nor evidently do Mammoths. And if there are tropical forests a mile under ice, where'd all the water come from necessary to bury a land mass that large under a mile of ice. Hmmm. Good questions all; but, evolution can't explain them as a whole. Oh well. looking forward to the entertainment to come.

There's just no evidence that life has been through noxious chemical changes in the atmosphere,

Oh, puh-leaze.

There are multiple clear lines of evidence that there was little to no oxygen in the atmosphere in ancient times. For example, iron, urananite, and pyrite are readily oxidized today, but are found unoxidized in Precambrian sediments, and oxidized in postcambrian sediments.

If you can think of any explanation for how those sediments were laid down all over the world while being prevented from being oxidized, *other* than "there wasn't any free oxygen in the atmosphere", let's hear it...