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An Iridium anomaly is an unusual deviation in the amount of the element Iridium (Ir) in a given geological layer (strata). Iridium is a very rare element to be found upon the Earth’s crust. In meteorites and comets however, it occurs in large quantities. The discovery of a layer with abnormally large amounts of iridium is seen as evidence of meteorite impact on Earth.
The best example of an iridium anomaly is found at the boundary between the Cretaceous and Paleogene, the so-called K-Pg boundary. The anomaly is found worldwide, which signifies a big impact with disastrous consequences. The iridium anomaly and the extinction of the dinosaurs and other life forms such as ammonites (mass extinction) are an indication of the correctness of this theory. The impact crater of this meteorite was found in the town of Chicxulub on isle the Yucatan in Mexico.
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