The science of determining the age of geological materials and assigning specific dates to events in Earth's history.
From geo- (earth) + chronology (from Greek chronos, time + logos, study). Emerged as a rigorous discipline when radioactive dating became available in the early 20th century.
Geochronology gave us the ability to read the absolute age of rocks instead of just their relative sequence—it's like upgrading from a history book to a history book with exact dates on every page.
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