In modern environments, pore water geochemistry and modelling simulations allow the study of methane (CH₄) sources and sinks at any geographic location. However, reconstructing CH₄ dynamics in geological records is challenging. Here, we show that the benthic foraminiferal δ³⁴S can be used to reconstruct the fux (i.e., difusive vs. advective) and timing of CH₄ ...