The permian extinction 200 million years ago ice or fire?

[RonO]

https://www.sciencedaily.com/releases/2024/10/241028164257.htms

These researchers think that the cold periods after the massive volcanic
eruptions cause the mass extinction 200 million years ago. Massive
amounts of carbon dioxide were expelled into the atmosphere, but they
think that the huge amounts of sulfates caused rapid cooling more than
once during these massive eruptions and that it was the cold that life
on earth could not survive.

Maybe the dinos were warm blooded even then and took over after the mass
extinction event.

Ron Okimoto

[John Harshman]

Post by RonO
https://www.sciencedaily.com/releases/2024/10/241028164257.htms
These researchers think that the cold periods after the massive volcanic
eruptions cause the mass extinction 200 million years ago.  Massive
amounts of carbon dioxide were expelled into the atmosphere, but they
think that the huge amounts of sulfates caused rapid cooling more than
once during these massive eruptions and that it was the cold that life
on earth could not survive.
Maybe the dinos were warm blooded even then and took over after the mass
extinction event.

Nope. There were no dinosaurs in the Permian, and the first dinosaurs
appear more than 20 million years after the extinction. And even then
they were fairly rare members of the fauna they were part of, so
couldn't be considered to have taken over.

[RonO]

Post by John Harshman

Post by RonO
https://www.sciencedaily.com/releases/2024/10/241028164257.htms
These researchers think that the cold periods after the massive
volcanic eruptions cause the mass extinction 200 million years ago.
Massive amounts of carbon dioxide were expelled into the atmosphere,
but they think that the huge amounts of sulfates caused rapid cooling
more than once during these massive eruptions and that it was the cold
that life on earth could not survive.
Maybe the dinos were warm blooded even then and took over after the
mass extinction event.

Nope. There were no dinosaurs in the Permian, and the first dinosaurs
appear more than 20 million years after the extinction. And even then
they were fairly rare members of the fauna they were part of, so
couldn't be considered to have taken over.

The article didn't call it the Permian extinction I messed up. The
dinos did survive the extinction event 200 million years ago that the
article was talking about.

Ron Okimoto

[John Harshman]

Post by John Harshman

Post by RonO
https://www.sciencedaily.com/releases/2024/10/241028164257.htms
These researchers think that the cold periods after the massive
volcanic eruptions cause the mass extinction 200 million years ago.
Massive amounts of carbon dioxide were expelled into the atmosphere,
but they think that the huge amounts of sulfates caused rapid cooling
more than once during these massive eruptions and that it was the
cold that life on earth could not survive.
Maybe the dinos were warm blooded even then and took over after the
mass extinction event.

Nope. There were no dinosaurs in the Permian, and the first dinosaurs
appear more than 20 million years after the extinction. And even then
they were fairly rare members of the fauna they were part of, so
couldn't be considered to have taken over.

The article didn't call it the Permian extinction I messed up.  The
dinos did survive the extinction event 200 million years ago that the
article was talking about.

Ah, I missed the bit about 200 million years ago. That would be the
end-Triassic extinctiion, a much smaller one, and dinosaurs did come to
dominate the charismatic megafauna after that.

[erik simpson]

Post by RonO
https://www.sciencedaily.com/releases/2024/10/241028164257.htms
These researchers think that the cold periods after the massive volcanic
eruptions cause the mass extinction 200 million years ago.  Massive
amounts of carbon dioxide were expelled into the atmosphere, but they
think that the huge amounts of sulfates caused rapid cooling more than
once during these massive eruptions and that it was the cold that life
on earth could not survive.
Maybe the dinos were warm blooded even then and took over after the mass
extinction event.
Ron Okimoto

Minor quibble, it was 250 Mya. The dinosaurs came toward the end of the
Triassic (suvivors of the late Triassic extinction). The heavy
predators for most of the Triassic were Crocodilians.

[William Hyde]

Post by RonO
https://www.sciencedaily.com/releases/2024/10/241028164257.htms
These researchers think that the cold periods after the massive volcanic
eruptions cause the mass extinction 200 million years ago.  Massive
amounts of carbon dioxide were expelled into the atmosphere, but they
think that the huge amounts of sulfates caused rapid cooling more than
once during these massive eruptions and that it was the cold that life
on earth could not survive.

Certainly sulphate aerosols act more rapidly than greenhouse gases.


Work on a site at the K/T border in Colorado shows first a shower of
small debris, then a cold period (frost damage evident in aquatic plants
gives an approximate time of year of July), followed by a slow prolonged
warming.

So Fire and Ice, not to mention wind and shock waves.

William Hyde