Table 1 Atmospheric oxygen level estimates based on the discrete method.
From: A persistently low level of atmospheric oxygen in Earth’s middle age
Group | Age | 5 percentiles | 10 percentiles | 15 percentiles |
|---|---|---|---|---|
pO2 (% PAL) | pO2 (% PAL) | pO2 (% PAL) | ||
Paleoproterozoic | 2500–1600 Ma | 1.0 | 1.6 | 2.4 |
Mesoproterozoic—early Neoproterozoic | 1600–650 Ma | 0.8 | 1.6 | 2.4 |
late Neoproterozoic—early Paleozoic | 650–400 Ma | 2.4 | 5.2 | 5.5 |
middle Paleozoic to modern | 400–0 Ma | 100 | 100 | 100 |
