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Swiss Journal of Palaeontology
Fig. 6 | Swiss Journal of Palaeontology

Fig. 6

From: Geochemical evidence (C and Sr isotopes) for methane seeps as ammonite habitats in the Late Cretaceous (Campanian) Western Interior Seaway

Fig. 6

Cross-plot of δ13C and δ18O in seep (AMNH loc. 3418) and non-seep ammonites in the D. cheyennense Zone. Values are ‰ relative to VPDB. “Other heteromorphs” include samples of Didymoceras and Spiroxybeloceras. Circles are drawn to enclose the values in the two groups and have no statistical significance. See Table 1 for a detailed statistical comparison of the δ13C data

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