Fig. 3 | Nature Communications

Fig. 3

From: Early Palaeozoic ocean anoxia and global warming driven by the evolution of shallow burrowing

Fig. 3

COPSE baseline model simulation. Simulation as presented in ref. 27. a Atmospheric CO2. b Average δ34SSO4 of seawater. c Pyrite fraction of sulphur burial. d Average δ13Ccarb of seawater. e Degree of ocean anoxia (1 = completely anoxic, 0 = completely oxic). f Summary of the evolution of sedimentary Mo concentrations over time. Model outcomes (in blue) are compared to δ13Ccarb and δ13SSO4 data and the sedimentary Mo concentrations, which is reflective of the extent of ocean oxygenation and is supported by multiple independent proxies (see Supplementary Note 1). Dotted lines in panels b and d represents a local regression (LOESS) fit to the data. Grey shaded areas indicate the Cambrian explosion (540–521 Ma) and the Great Ordovician Biodiversification Event (GOBE; 470–450 Ma). Blue shaded line indicates the Hirnantian glaciation

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