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.
These findings are interesting all on their own but the *how* is also interesting.
quote:Despite a century of searching, the site had previously yielded few fossils — until paleontologist Tyler Lyson realized in 2016 that bones were preserved inside nodules of rock called concretions, rather than visible among the surface rocks.
Here is Dr. Lyson on how he made his breakthrough.
Oh poor dears, they did make a great find but they just keep missing the truth that all those creatures were buried in the Flood of Noah, not evolved, and "after" the dinosaurs not in great aeons of time, but only in the sense that they were buried above them.
Poor dears, they did make a great find but they just keep missing the truth that all those creatures were buried in the Flood of Noah, not evolved, and "after" the dinosaurs not in great aeons of time, but only in the sense that they were buried above them.
They all float down there. Wilma, Fred, Bam-Bam--everybody.
"If you can keep your head while those around you are losing theirs, you can collect a lot of heads."
Homo sum, humani nihil a me alienum puto. -Terence
So in this case instead of the bones getting fossilized by the replacement of bone material with a fossilizing mineral this mineral collected AROUND the bones instead and built up a rounded casing for them? So inside these concretions are unfossilized bones? Why the different process?
AbE watched it again. There's one point where they say the bones were ALSO fossilzed so I guess that answers my question. Why they also formed this ball of mineral within the rock is still a question though.