Six Mass Extinctions

[tabibito]

Did I break this thread by mentioning one out of order?

Sort of. Most of my photos turned out to be unusable. However:

Nilpena and the wider sites around Parachilna are considered so unique and important to our understanding of the origins of life on Earth that a new geological period was declared in 2004 – the first in 120 years.

The Ediacaran Era, sandwiched neatly between the Cryogenian and Cambrian eras, spans 630 to 542 million years ago.

Ediacara itself is 520km or so due north of Adelaide.

Aspidella.jpg

Dickinsonia.jpg

[rogue06]

They originated in the Early Cambrian and went extinct during the Permian-Triassic Extinction event (thought to be the worst), so they were around for over a quarter of a billion years (give or take a few weeks).

Did I break this thread by mentioning one out of order?

[shunyadragon]

It's the Quaternary extinction, listed as the sixth. So far its only tens of thousands of years in progress.

I realize they are close, but I would call this current extinction different from the Quaternary extinction, because the cause is distinctly different, human impact of over population plus human caused global warming,

The Quaternary extinction actually began 130,000 years ago with the natural climate change. The emphasis as to whether climate change or human cause by Neolithic humans is controversial. Humans may have had an impact as their numbers decreased recently below the healthy survival limits of the populations, but by the evidence most of the megafauna was already doomed with decreased populations.

[tabibito]

By the evidence as far as extinction events we are experiencing number 7 now.

It's the Quaternary extinction, listed as the sixth. So far its only tens of thousands of years in progress.

[shunyadragon]

By the evidence as far as extinction events we are experiencing number 7 now.

[rogue06]

? The museum write-up implies that trilobites were around in the Ordovician (top paragraph, right), and survived through the first of the mass extinctions (top paragraph, left)

They originated in the Early Cambrian and went extinct during the Permian-Triassic Extinction event (thought to be the worst), so they were around for over a quarter of a billion years (give or take a few weeks).

[tabibito]

Trilobites first appeared in the Early Cambrian

If I had to hazard a guess, I'd say maybe a Sprigginia (which some think is a precursor/ancestor of trilobites)

DSC02833.JPGDSC02834.JPG

? The museum write-up implies that trilobites were around in the Ordovician (top paragraph, right), and survived through the first of the mass extinctions (top paragraph, left)

[rogue06]

From what I remember, it's one of the blue things (bottom right)

excerpt.jpg

spriggina-fossil-222psd.jpg

[tabibito]

Trilobites first appeared in the Early Cambrian

If I had to hazard a guess, I'd say maybe a Sprigginia (which some think is a precursor/ancestor of trilobites)



Spriggina,_Ediacaran_metazoan,_Vendian,_Ediacara_Hills,_south_Australia_-_Houston_Museum_of_Natural_Science_-_DSC01385.JPG

From what I remember, it's one of the blue things (bottom right)

excerpt.jpg

[rogue06]

I haven't sifted through all the photos yet, but I have a vague recollection of it being a trilobite.

Trilobites first appeared in the Early Cambrian

If I had to hazard a guess, I'd say maybe a Sprigginia (which some think is a precursor/ancestor of trilobites)



Spriggina,_Ediacaran_metazoan,_Vendian,_Ediacara_Hills,_south_Australia_-_Houston_Museum_of_Natural_Science_-_DSC01385.JPG

[tabibito]

DSC02833.JPGDSC02834.JPG

[tabibito]

Not sure what the first one is but the second is easily recognizable as Dickinsonia, and from the Late Ediacaran (before the Cambrian Period)

I understand that mossy thought they made for a cute beret.

I haven't sifted through all the photos yet, but I have a vague recollection of it being a trilobite.

[rogue06]

DSC02858.JPG
DSC02856.JPG

Forgot to photograph the information - I think these are from the Ediacaran Era.

Not sure what the first one is but the second is easily recognizable as Dickinsonia, and from the Late Ediacaran (before the Cambrian Period)

I understand that mossy thought they made for a cute beret.

[tabibito]

DSC02858.JPG
DSC02856.JPG

Forgot to photograph the information - I think these are from the Ediacaran Era.

[rogue06]

Looks like a menu. Maybe CP can light the barby.

I think I'll go with the Velocirabbit cutlets sautéed in Sea Flap Flap juice over some Danger Noodles. Oh. Can I get a couple of Ouch Muffins with that?