CATHERINE POUEDRAS / EURELIOS / SCIENCE PHOTO LIBRARY CATHERINE POUEDRAS / EURELIOS / SCIENCE PHOTO LIBRARY
Evidence for dinosaur extinction by an asteroid electron micrograph of an aggregate of magnetite about 100 microns in diameter, found in the layer between Cretaceous and Tertiary rocks. This layer, the K/T boundary, is a clay thought to have been deposited after an asteroid impact about 65 million years ago. The nickel-rich magnetite is not made on Earth but arrives either as cosmic dust or during an asteroid encounter. The high magnetite abundance observed at the K/T boundary supports the view that a catastrophic impact event occurred at the time of the extinction of the dinosaurs.
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