Fig. 4From: 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 shellsa δ18O versus δ13C values of well-preserved oysters and brachiopods compared to samples of poorly preserved oysters, sediment, and cement; b–d 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 compositionsBack to article page