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K-Pg boundary

The K-Pg boundary is the stratigraphical name for a mass extinction event, during the end of the Cretaceous period. Due to the impact of a meteorite, a crater of 180 kilometers of diameters formed around a place, that is now known as the town of Chicxulub, in Yucatan (Mexico). The impact has had a major effects on global climate and life.

Among the major victims of this impact were the dinosaurs and ammonites. Most of these species died as a result to the climatological changes following the impact. Also, many species of corals, sea urchins and bivalves became extinct.

When investigating the geological deposits of the K-Pg boundary, there is a worldwide iridium anomaly. This anomaly is an unusual deviation in the amount of the element iridium. Iridium is a rare element, found is very small concentrations in inside the Earth’s crust. But in meteorites and comets, it occurs in large quantities. The discovery of a layer with abnormally large amounts of iridium is seen as an evidence for the impact of  a meteorite on Earth.

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