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Author Topic:   Mammals rebound
RAZD
Member (Idle past 518 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


(2)
Message 1 of 20 (865741)
10-30-2019 12:30 AM


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

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

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.


more at link

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Replies to this message:
 Message 3 by AZPaul3, posted 10-30-2019 6:50 PM RAZD has acknowledged this reply

  
RAZD
Member (Idle past 518 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 8 of 20 (865824)
10-31-2019 11:58 AM
Reply to: Message 4 by Faith
10-30-2019 10:26 PM


not debate/discussion thread
Faith, jar,

Links and Information threads are not debate/discussion threads.

Thanks.

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Edited by RAZD, : .


we are limited in our ability to understand
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RAZD
Member (Idle past 518 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 17 of 20 (865874)
11-01-2019 12:43 PM
Reply to: Message 16 by caffeine
11-01-2019 10:50 AM


Re: Mammals not fossilized in the usual way?
There was interesting research on this question recently too. Bunch of researchers from Japan argue that it's due to the release of calcium from bones interacting with clay of certain chemical compositions; and that these calcite concretions probably only take a few years to form.

Full article in Nature here (open access).

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?

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we are limited in our ability to understand
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