We could be on the cusp of a new geological epoch. Scientists around the world are currently voting on whether the changes we've made to the planet are significant enough to warrant a formal declaration that we've moved out of the Holocene epoch and into the Anthropocene. Colin Waters from Leicester University in the UK, and chair of the Anthropocene Working Group, is leading an effort to select a single site that best characterises the boundary layer between the two epochs. Francine McCarthy from Brock University is championing a Canadian site located in Milton, Ontario, which could become the poster child for our planet’s transition into the Anthropocene.