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iridium anomaly |
Also found in: Wikipedia | 0.04 sec. |
iridium anomalyUnusually high concentrations of the element iridium found worldwide in sediments that were deposited at the Cretaceous-Tertiary boundary (K-T boundary) 65 million years ago. Since iridium is more abundant in extraterrestrial material, its presence is thought to be evidence for a large meteorite impact that may have caused the extinction of the dinosaurs and other life at the end of the Cretaceous. |
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| The iridium anomaly seems to be related to a large quantity of siderolite material most likely from a 10-km asteroid that struck Earth 65 million years ago. This gives us the opportunity to prove that the iridium anomaly in an ejecta [debris] layer can be traced back to the cratee," says Robertson. |
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iridium anomaly
