Fig. 15From: Neogene molluscs, shallow marine paleoenvironments, and chronostratigraphy of the Guajira Peninsula, ColombiaReference curve of Howarth and McArthur (1997) for the Early and Middle Miocene (18–12 Ma) overlain by 87Sr/86Sr isotope ratios from this study. Confidence intervals of the mean line are drawn at 95 % confidence interval. Asterisk samples not analyzed in this studyBack to article page