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Scientific American The Asteroid That Killed the Dinosaurs Created the Amazon Rain Forest Fossilized pollen and leaves reveal that the meteorite that caused the extinction of nonavian dinosaurs also reshaped South America’s plant communities to yield the planet’s largest rain forest Print View of the Amazon rain forest at Amacayacu National Natural Park in Colombia in 2010. Credit: Mayela Lopez Dinosaur and fossil aficionados are intimately familiar with the meteorite strike that drove Tyrannosaurus rex and all nonavian dinosaurs to extinction around 66 million years ago. But it is often overlooked that the impact also wiped out entire ecosystems. A new study shows how those casualties, in turn, led to another particularly profound evolutionary outcome: the emergence of the Amazon rain forest of South America, the most spectacularly diverse environment on the planet. Yet the Amazon’s bounty of tropical species and habitats now face their own existential threat because o

United statesNew zealandLos angelesMayela lopezBonnie jacobsPeter wilfRegan dunnCarlos jaramilloSouthern methodist universitySmithsonian tropical research institutePennsylvania state universityMuseum in los angelesAmacayacu national natural parkSouth americaWestern europeanNorth american