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Re: egg development and O-2

Has anyone compared the pore diameters of fossil hard-shell archosaur
eggs (pick a group) over geologic time?

Probably not, but it should be easy to do... except perhaps for the fact that known fossil eggs are very unevenly distributed over time...

There must have been at least a few taxa around at the Permian-Triassic
boundary that layed hard-shelled eggs.

Why? The archosaur crown-group is surely younger than that; so are the geckos and so are the few turtles that lay hard-shelled eggs.