By Eric Hand
ST. LOUIS POST-DISPATCH
11/30/2006
Geologists have long known that the fossil record suddenly dies off 65 million years ago between two geological periods: the Cretaceous and the Paleogene.
Evidence for a doomsday rock from outer space built when, around the globe, geologists found a layer of clay right at the boundary of those periods. The clay contained iridium, a rare substance on Earth but common in meteorites.
New evidence that meteorite killed the dinosaurs, MU researcher finds
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