1980 — Luis Alvarez, Walter Alvarez, Frank Asaro, and Helen Michel propose the Alvarez hypothesis, that a comet or asteroid struck the Earth 66 million years ago causing the Cretaceous–Paleogene extinction event, including the extinction of the non-avian dinosaurs, and enriching the iridium in the K–T boundary.
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1815 — William Smith published The Map that Changed the World, the first geologic map of England, Wales, and southern Scotland, using fossils to correlate rock strata.
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