Thriving in a Series of Sudden Global Chills That Killed Competitors Many of us are familiar with the popular theory of how the dinosaurs died 66 million years ago: in Earth’s violent collision with a meteorite, followed by a global winter caused by dust and debris choking the atmosphere. But there
With a lava flow in the distance, a primitively feathered theropod dinosaur carries off a mammalian victim during a snowy volcanic winter caused by massive eruptions during the Triassic-Jurassic Extinction. A new study says dinosaurs survived because they were already adapted to freezing conditions at high latitudes.
The study, based on recent excavations in the remote desert of northwest China’s Junggar Basin, was published today in the journalThe supercontinent of Pangaea 202 million years ago, shortly before the Triassic-Jurassic Extinction. Evidence of early dinosaurs has been found in the indicated areas; most species were confined to the high latitudes, and those few nearer the tropics tended to be smaller. Red area at the top is the Junggar Basin, now in northwest China. Credit: Olsen et al.
At the end of the Triassic, a geologically brief period of perhaps a million years saw the extinction of more than three-quarters of all terrestrial and marine species on the planet, including shelled creatures, corals and all sizable reptiles. Some animals living in burrows, such as turtles, made it through, as did a few early mammals. It is unclear exactly what happened, but many scientists connect it to a series ofthat could have lasted hundreds of years at a stretch.
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