What is the iridium anomaly?

Pick one of the below:
A type of meteorite
Unusually high concentration of iridium in a clay layer
A volcanic ash layer
A type of dinosaur fossil

1 answer

The iridium anomaly refers to an unusually high concentration of iridium in a clay layer. This phenomenon is primarily associated with the Cretaceous-Paleogene (K-Pg) boundary, marking the extinction event that wiped out the dinosaurs and many other species around 66 million years ago, which is thought to have been caused by a massive asteroid impact.

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