Mammals rebound

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Remarkable fossils capture mammals’ recovery after the dino-killing asteroid

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By John Pickrell
October 24, 2019 at 2:00 pm

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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.

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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.

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Faith, jar,Links and Information threads are not debate/discussion threads.Thanks.EnjoyEdited by RAZD, : .

Interesting that the calcite concretions did not cover the shell of the Yatsuo tusk-shell. I would think it was made from calcium carbonate. Presumably the calcium was already bonded as calcium carbonate and not free calcium from the bones?Also, I note these are marine deposits, whereas I was under the impression that the mammal fossils were terrestrial. How would this process occur under terrestrial conditions?Enjoy