This essay considers the recently translated volume “Sediments of Time. On Possible Histories” by Reinhart Koselleck in relation to contemporary debates on history writing and the Anthropocene. Ever since the notion of human geological agency emerged, the relationship between human and natural history has been increasingly in flux, opening up new questions regarding the properties of historical time. “Sediments of Time” offers a conceptual apparatus that can be utilized in new ways in an Anthropocene context, in particular to historicize how geological time entered human history in the twentieth and twenty-first centuries.