Strontium isotope stratigraphy in the Late Cretaceous: Numerical calibration of the Sr isotope curve and intercontinental correlation for the campanian

The white Chalk exposed in quarries at Lägerdorf and Kronsmoor, northwestern Germany, provides a standard section for the European Upper Cretaceous. The 87 Sr/ 86 Sr values of nannofossil chalk and belemnite calcite increase upward through 330 m of section, from ≤0.70746 in the Upper Santonian to ≥0.70777 in the Lower Maastrichtian. The data define three linear trends separated by major points of inflection at stratigraphic heights in the...