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Figure S1. Shifts in redox across the Changhsingian–Griesbachian boundary. In contrast to the Capitanian extinction event (Fig. 9), the Changhsingian extinction demonstrates a strong redox shift towards more chemically reducing conditions. This can be seen in both the gleization (Fe2+/Fe3+) ratio and Eu content. Data used to construct this plot are from Sheldon (2006).

Figure S2. Ce content in palaeosols across the Changhsingian–Griesbachian. In contrast to the Capitanian extinction event (Fig. 9), the Changhsingian extinction demonstrates a strong redox shift towards more chemically reducing conditions as indicated by increasing Ce content in Griesbachian palaeosols relative to Changhsingian ones. Data used to construct this plot are from Sheldon (2006).

Table S1. Major element data.

Table S2. Trace element data – Part I – complete Capitanian Extinction Section.

Table S3. Rare Earth Element and Trace Element Data – Part I – complete Capitanian Extinction Section.

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