Supplemental Material: Is volcanic ash responsible for the enrichment of organic carbon in shales? Quantitative characterization of organic-rich shale at the Ordovician-Silurian transition

Appendix 1: TOC, major element and trace element analysis results of samples from the Wufeng and Longmaxi formations; Appendix 2: Ash correction calculation results for the study area based on ash data from this and previous studies.