Figure 4
From: Climatic backdrop for Pueblo cultural development in the southwestern United States
δ18O versus δ13C values illustrate an isotope fractionation trend due to evaporation and rapid CO2 degassing. This trend is color-coded for each climatic sub-period and exhibits higher values along the trend that are coincident with the Pueblo period and with the last 150 years. Top and bottom graphs represent the same data uncorrected (A) and corrected (B) for percent of aragonite, respectively (Supplementary Information S4).
