E-Mail IMAGE: A compilation of pyrite sulfur isotope data showing global occurrences of superheavy pyrite in the Cryogenian interglacial period. After the Sturtian glaciation, mid-depth seawater column was sulfidic which was sustained... view more Credit: ©Science China Press The Sturtian Snowball Earth glaciation (717~660 million years ago) represents the most severe icehouse climate in Earth's history. Geological evidence indicates that, during this glaciation, ice sheets extended to low latitudes, and model simulations suggest global frozen ocean as well as a prolonged shut-do...