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Figure F3. Comparison between X-ray diffraction and coulometer methods for determining carbonate mineral contents in samples, Sites U1351–U1354. A strong correlation with minimal offset (i.e., a slope close to 1) is seen for a range of carbonate concentrations indicating the validity of the RockJock method. Regression performed on data only from that range of concentrations and outliers were not used in the regression, as they likely represent heterogeneity in sample composition (e.g., shell fragment). Coulometer data from

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