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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Credit: | Science Photo Library / Pouedras, Catherine / EURELIOS |
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