Understanding how life rebounded after an asteroid strike 66 million years ago, which wiped out up to 75 percent of Earth’s species and ended the dinosaurs’ reign, has been hard. Fossils from the immediate aftermath are exceedingly rare (SN: 4/2/19). Now, though, a fossil-rich deposit in Colorado’s Denver Basin is offering paleontologists a window into how mammals, plants and reptiles recovered and flourished following the impact.
The find has allowed the scientists to piece together a detailed timeline of how mammals quickly diversified and grew in size once nonavian dinosaurs were out of the way. Within 700,000 years after the impact, for instance, some mammals had grown to be 100 times as heavy as the original survivors, researchers report online October 24 in Science.
“This is one of those discoveries all paleontologists dream of,” says Steve Brusatte, a paleontologist at the University of Edinburgh who was not involved in the research. “With a snap of a finger, mammals took over from the dinosaurs. More than 150 million years of dinosaur dominance was ended, just like that, and our ancestors took over.”
Read more here: Sciencenews.org
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