Science Advances

Supplementary Materials

The PDFset includes:

  • Supplementary discussion on quantifying mineralogy using XRD
  • Table S1. XRD peak areas for calcite 104 (Acalc) and aragonite 111 (Aarag) of calibration materials and bivalves from the CRNWR excavation site.
  • Fig. S1. XRD scans of pure aragonite and calcite.
  • Fig. S2. Relative peak area for aragonite and calcite relative to the molar fraction of each mineral.
  • Fig. S3. Photographs of all shells analyzed in this study.
  • Fig. S4. Cross plot of δ13C and δ18O values for all modern and shell midden bivalves discussed in the main text.
  • Legend for data S1

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Other Supplementary Material for this manuscript includes the following:

  • Data S1 (Microsoft Excel format). Isotopic analyses of equilibrated gases, Cabo Rojo bivalves, and ETH carbonate standards.

Files in this Data Supplement: