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the claim

The Carboniferous period featured exceptionally high levels of atmospheric oxygen

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the Carboniferous period featured exceptionally high levels of atmospheric oxygen?

Yes. Multiple studies and fossil evidence indicate that the Carboniferous period experienced exceptionally high atmospheric oxygen levels (hyperoxia), which is widely linked to the evolution of insect and arthropod gigantism during that era.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The analysis

The claim states that the Carboniferous period featured exceptionally high levels of atmospheric oxygen. This is a specific, empirical, and well-studied geological/paleontological claim that passes Step 0. Among the retrieved papers, several directly discuss late Paleozoic/Carboniferous hyperoxia and its role in supporting giant arthropods (papers 0, 2, 4, 11). None of the papers refute this premise; they either support it or discuss unrelated topics (such as sulfur isotopes, modern hermetic storage, or early Paleozoic marine extinctions). Therefore, the verdict is SUPPORTED.

Evidence for · 4
Atmospheric oxygen level and the evolution of insect body size.
2010
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JF, H., A, K., & JM, V. (2010). Atmospheric oxygen level and the evolution of insect body size.. doi.org. https://doi.org/10.1098/rspb.2010.0001

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More for · 3
Can oxygen set thermal limits in an insect and drive gigantism?
2011
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WC, V. & DT, B. (2011). Can oxygen set thermal limits in an insect and drive gigantism?. doi.org. https://doi.org/10.1371/journal.pone.0022610

Gigantism and Its Implications for the History of Life.
2016
Get citation
GJ, V. (2016). Gigantism and Its Implications for the History of Life.. doi.org. https://doi.org/10.1371/journal.pone.0146092

Animal evolution and atmospheric pO2: is there a link between gradual animal adaptation to terrain elevation due to Ural orogeny and survival of subsequent hypoxic periods?
2014
Get citation
Kurbel, S. (2014). Animal evolution and atmospheric pO2: is there a link between gradual animal adaptation to terrain elevation due to Ural orogeny and survival of subsequent hypoxic periods?. doi.org. https://doi.org/10.1186/1742-4682-11-47

Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 8804 Aug 2026
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