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SlideshowReport

The K–T Boundary Layer

Description
A mass extinction of major groups of organisms, including dinosaurs, occurred 65.5 million years ago – marked by an unusual layer of rock called the K–T boundary layer

A gigantic impact crater  off the coast of the Yucatán Peninsula also dates to about 65.5 million years ago

Scientists infer that the impact caused a global catastrophe of sufficient scale to wipe out the dinosaurs
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