Scientists say that early dinosaurs survived the mass extinction between the Triassic and Jurassic periods because they adapted to the cold.
. Tanystropheus with three-meter-long necks, aetosaurs with armored shields on their backs and drepanosaurs with prehensile tails, reigned before dinosaurs took the throne.
The Late Triassic is generally thought as the “greenhouse Earth.” Volcanic eruptions blasted carbon dioxide into the atmosphere at record levels, warming the earth and acidifying the oceans. There’s no evidence of polar ice sheets. Instead, forests extended into the higher latitudes. The researchers found the first evidence for decade-long cold snaps in the ancient lakes of northwest China. The lake basin is made of fine silts and sands. But unexpectedly, the researchers also found pebbles up to 1.5 centimeters wide.
“This is the first evidence of truly icy conditions,” says Randall Irmis, curator of paleontology at the Natural History Museum of Utah“This shows that these areas froze regularly, and the dinosaurs did just fine,” Dennis Kent, co-author and research scientist at Columbia University says in a press release.
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