Tropical sea surface temperatures during the Palaeozoic era were reconstructed from fossil shells using the 'carbonate clumped isotope' method, which, unlike the oxygen isotope method, does not require independent estimates of the isotopic composition of seawater. Estimates indicate that carbon dioxide concentrations and surface temperatures were closely coupled during the Palaeozoic era, supporting the view that variations in atmospheric carbon dioxide concentration led to significant variations in global temperature.
- Rosemarie E. Came
- John M. Eiler
- Christopher R. Weidman
