... proton-microbe technique, increase markedly through ontogeny, however, suggesting that more Sr was incorporated as growth rate slowed rather than as a result of changing paleotemperature. Comparative δ 18 O and Sr/Ca data from the broadly coeval marine gastropod Clavilithes macrospira , which exhibits...

...Louise Purton; Martin Brasier Abstract High-resolution δ 18 O and δ 13 C measurements obtained from the gastropod Clavilithes macrospira provide the most detailed record of seasonal change in temperature (range ∼14 °C), seawater chemistry, and bottom-water ventilation yet obtained from late Eocene...

... ( Stecher III et al., 1996 ) and the gastropod Clavilithes macrospira ( Purton et al., 1999 ). Calcification in summer imparts a low δ 18 O signature to molluskan shell, reflecting higher lagoonal water temperatures and higher Sr/Ca, which suggests either a fundamental temperature dependence on the value...