Extended Data Fig. 4: Co-variation between Δ′17Osulfate and δ13Ccarb across major negative carbon isotope excursions.
From: Two-billion-year transitional oxygenation of the Earth’s surface
a-f, Majiatun (940 Ma), BSA (Bitter Springs Anomaly; 805 Ma), Trezona (643 Ma), CANCE (CAp carbonate Negative Carbon isotope Excursion; 635 Ma), SE (Shuram Excursion; 570 Ma), and BACE (BAsal Cambrian Carbon isotope Excursion; 539 Ma). All data are newly reported in this study, except for SE records, which are compiled from ref. 38 (circles, South China; triangles, South Australia). Dashed lines represent LOWESS fits. Analytical uncertainty (1σ) is shown only for Δ′17Osulfate; uncertainties for δ13Ccarb are smaller than the symbol size.
