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Fig. 4 | Journal of Palaeogeography

Fig. 4

From: First steps in reconstructing Early Jurassic sea water temperatures in the Andean Basin of northern Chile based on stable isotope analyses of oyster and brachiopod shells

Fig. 4

a δ18O versus δ13C values of well-preserved oysters and brachiopods compared to samples of poorly preserved oysters, sediment, and cement; bd δ18O versus δ13C values of the three oysters used for high-resolution analyses. The δ18O and δ13C values of specimen CH18-006 are strongly correlated and believed to show the influence of diagenetic alteration. In contrast, the results of CH18-017 and CH18-030 show no correlation and are believed to represent original compositions

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