Geologists have found that the boundary between the Cretaceous and Paleogene layers called the “K–Pg” boundary (previously known as the "K-T boundary"), in many regions is marked by high levels of the rare metal iridium. While it is true that nearly all dinosaur fossils are absent above this K-Pg boundary, the areas with high iridium levels are not restricted to the thin zone that defines this boundary. In fact, in the same regions where the K-PG boundary was discovered, recent studies have iden
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