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Concurrent gaps in the Late Devonian/Mississippian fossil records of insects and tetrapods (i.e. Romer's Gap) have been attributed to physiological suppression by low atmospheric pO2. Here, updated stable isotope inputs inform a reconstruction of Phanerozoic oxygen levels that contradicts the low oxygen hypothesis (and contradicts the purported role of oxygen in the evolution of gigantic insects during the Late Palaeozoic), but reconciles isotope-based calculations with other proxies, likedoi:10.6084/m9.figshare.5777517.v1 fatcat:v2bq4ohdtvg43pbtnzhukevoza