Abstract
Oxygen isotope determinations of well-preserved aragonitic shell material from the Selandian (Heersian) glauconitic limestones and marls at Copenhagen seem to indicate that the 18O/ 16O ratios have not changed significantly since burial. Analyses of the Sr, Mg and 13C content in the shells and the surrounding sediments support this assumption. Related fossils of nearly the same age from other Danish Paleocene localities show the same mean 18O/ 16O ratio as is found in the shell material from Copenhagen. This may suggest almost identical oceanographic conditions in the area. Interpreted as paleo-temperatures the oxygen isotope ratios correspond to an average sea temperature of 12–14°C. These values may indicate cooler climatic conditions in the Danish Paleocene sea as compared to Late Cretaceous and Eocene conditions.
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