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In the Northern Hemisphere, seasonal flowers had just started blossoming, trees were budding and fish had begun to forage. It was early spring in the Cretaceous, 66 million years ago, moments before a seven-mile-wide asteroid would hit the Yucatan with blustering force. A few hours later, most life within 3,000 miles would be dead, killed by debris, burned alive or poisoned.
Using paddlefish and sturgeon fossils found in modern North Dakota, During showed that the asteroid hit Earth in early spring, in recent study published in. The catastrophe came just when animals were hatching and vegetation was blooming, instantly killing the next generation. And those that didn’t die initially, would soon fall under the weight of famine.
Both species do most of their foraging in spring and summer, but had not yet reached their peak summer size. Debris found in the gills of the fish showed that they likely died as a result of a continent-sized typhoon around an hour after the mighty Chicxulub asteroid barreled into Earth. It’s also true that many of the lineages of both species survived in the Southern Hemisphere, says During, where it was already fall and they were likely sheltering for winter. Both could have lived underground during the "nuclear winter" that befell the skies above.The Earth was the victim of numerous "wrong-place-wrong-time" elements that made the disaster more deadly, says, a paleontologist at the University of Edinburgh who was not involved in the study.
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