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iridium anomaly

   Also found in: Wikipedia 0.04 sec.

iridium anomaly

Unusually 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.
Paleoecotoxicology: the impact of chemical and physical stress in the ... by Herkovits, Jorge / Environmental Health Perspectives
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.
Big splash from an ancient fall by Monastersky, Richard / Science News
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