Intellectually Curious

Timekeepers in Stone: How Geochronology Dates the Deep Past

Mike Breault

Geochronology isn't just about lining up events—it's about giving them dates. We'll tour how scientists move from relative orders to absolute ages using decay clocks like carbon-14, bracketing with potassium-argon and uranium-series methods, and techniques such as ESR and optically stimulated luminescence. A cross-checked dating of Homo naledi shows how combining clocks can rewrite our timeline of human evolution.


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