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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The dinosaur extinction wasn't the worst mass extinction, it was the middle one. The Permian-Triassic event 244 million years ago wiped out 90 to 95 percent of all life on Earth, terrestrial and marine. Nearly everything died, and we're still arguing about what caused it. The leading possibility is a combination of extraterrestrial impact and extreme volcanism, but there's no definitive answer for the most catastrophic event in the history of life on this planet. | The Randall Carlson
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Dinosaurs ruled the world for roughly 140 million years—until they suddenly disappeared. https://on.natgeo.com/2ZQ3OfP | National Geographic
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Examining the origins of the K-T extinction | Britannica
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Examining the origins of the K-T extinction | Britannica
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