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While you’ve probably heard of the Triassic, Jurassic, and Cretaceous periods by way of their most charismatic animals, the dinosaurs, other units of geologic time are less well known. The Siderian Period, for example, rarely makes headlines because it is, by definition, old news – 2.5-billion-year-old news. However, discussions of geologic time recently sprang up in news feeds when geologists considered shaking things up and declaring the end of the Holocene Epoch, which we’ve been living in since the last Ice Age ended more than 11,000 years ago. The idea was to cap the Holocene by sectioning off a new unit of time called the Anthropocene – the age of humans. Here we’ll dig into the geologic time scale to see why it matters and what the idea of the Anthropocene Epoch is all about.