Isotopic Equilibrium between Shells and Their Environment

See allHide authors and affiliations

Science  23 Feb 1968:
Vol. 159, Issue 3817, pp. 874-875
DOI: 10.1126/science.159.3817.874


The carbon-isotopic composition of shell carbonate is shown to be in isotopic equilibrium with bicarbonate dissolved in the water. By measurement of both 13C and 18O in a series of brackish-water shells a mean growth temperature can be deduced.