Figure 4: Δ47-temperature relationships for different groups of freshwater carbonates. Left: Δ47-temperature relationship for all carbonate types included in this study. Black line represents a linear, ordinary least squares regression through the data. We find a strong relationship between Δ47 and temperature for each group of data. We find indistinguishable slopes between all groups of data, but find statistically different intercepts between a majority of datasets (Table 3), suggesting that material-specific calibrations may be most appropriate. Right: Derived comparison of our material-specific calibrations to previously published clumped isotope calibrations. We find statistically similar slopes between all of our material-specific regressions and the slopes presented in Petersen et al. (2019) and Anderson et al. (2021), showing a convergence of slope (temperature dependence) throughout the studies. However, we find significant differences in intercept between previously published work and most of our derived calibrations (Table 3), indicating these calibrations are systematically offset from each other.