Globally asynchronous sulphur isotope signals require re-definition of the Great Oxidation Event Autor Pascal Philippot, Janaína N. Ávila, Bryan A. Killingsworth, Svetlana Tessalina, Franck Baton, Tom Caquineau, Elodie Muller, Ernesto Pecoits, Pierre Cartigny, Stefan V. Lalonde, Trevor R. Ireland, Christophe Thomazo, Martin J. van Kranendonk, Vincent Busigny