An interesting paleoclimate study that changes the way we should possibly think about the dinosaur demise, with a warning of where we are going today.

>>Professor MacLeod’s team analysed the chemical composition of sand-grain-sized fragments of fish fossils embedded in the sedimentary layers below and above the Cretaceous-Paleogene boundary, signifying the 50,000 years preceding and 300,000 years after the collision.

When fish build minerals in their teeth, bones and scales, the temperature of the surrounding water dictates how much of a specific type or isotope of oxygen, called oxygen-18, is laid down.

In the El Kef fish fossils, he and his team found the signature of a rapid, intense rise in temperature from around 20 to 25 degrees Celsius, which was sustained for 100,000 years before dropping back to pre-collision levels.

And because of polar amplification, which tends to produce bigger climate swings near the poles than the equator, it’s likely the polar regions warmed even more than the 5 degrees calculated at El Kef, Professor MacLeod said.

You might have been taught that when the asteroid that killed the dinosaurs smashed into the Earth, fine particles were blasted into the atmosphere, blocking the sun and causing global cooling.

Even though this may have been the case in some parts, particularly close to the impact site, any local effects would have soon been swamped by overall global warming, said Andrew Glikson, a palaeoclimatologist at the Australian National University, who was not involved with the study.<<

http://www.abc.net.au/news/science/2018-05-25/dinosaur-killing-asteroid-impact-global-warming-fossils-el-kef/9796244

PermeateFree said:

An interesting paleoclimate study that changes the way we should possibly think about the dinosaur demise, with a warning of where we are going today.

>>Professor MacLeod’s team analysed the chemical composition of sand-grain-sized fragments of fish fossils embedded in the sedimentary layers below and above the Cretaceous-Paleogene boundary, signifying the 50,000 years preceding and 300,000 years after the collision.

When fish build minerals in their teeth, bones and scales, the temperature of the surrounding water dictates how much of a specific type or isotope of oxygen, called oxygen-18, is laid down.

In the El Kef fish fossils, he and his team found the signature of a rapid, intense rise in temperature from around 20 to 25 degrees Celsius, which was sustained for 100,000 years before dropping back to pre-collision levels.

And because of polar amplification, which tends to produce bigger climate swings near the poles than the equator, it’s likely the polar regions warmed even more than the 5 degrees calculated at El Kef, Professor MacLeod said.

You might have been taught that when the asteroid that killed the dinosaurs smashed into the Earth, fine particles were blasted into the atmosphere, blocking the sun and causing global cooling.

Even though this may have been the case in some parts, particularly close to the impact site, any local effects would have soon been swamped by overall global warming, said Andrew Glikson, a palaeoclimatologist at the Australian National University, who was not involved with the study.<<

http://www.abc.net.au/news/science/2018-05-25/dinosaur-killing-asteroid-impact-global-warming-fossils-el-kef/9796244

Since dinosaurs are believed to have been great emitters of methane, it seems to me that this is more likely to have been the source of the climate change, rather than the asteroid impact.

So on that hypothesis the dinosaurs farted themselves to death.

The analogy with where we are going today seems even stronger.

The Rev Dodgson said:

PermeateFree said:

An interesting paleoclimate study that changes the way we should possibly think about the dinosaur demise, with a warning of where we are going today.

>>Professor MacLeod’s team analysed the chemical composition of sand-grain-sized fragments of fish fossils embedded in the sedimentary layers below and above the Cretaceous-Paleogene boundary, signifying the 50,000 years preceding and 300,000 years after the collision.

When fish build minerals in their teeth, bones and scales, the temperature of the surrounding water dictates how much of a specific type or isotope of oxygen, called oxygen-18, is laid down.

In the El Kef fish fossils, he and his team found the signature of a rapid, intense rise in temperature from around 20 to 25 degrees Celsius, which was sustained for 100,000 years before dropping back to pre-collision levels.

And because of polar amplification, which tends to produce bigger climate swings near the poles than the equator, it’s likely the polar regions warmed even more than the 5 degrees calculated at El Kef, Professor MacLeod said.

You might have been taught that when the asteroid that killed the dinosaurs smashed into the Earth, fine particles were blasted into the atmosphere, blocking the sun and causing global cooling.

Even though this may have been the case in some parts, particularly close to the impact site, any local effects would have soon been swamped by overall global warming, said Andrew Glikson, a palaeoclimatologist at the Australian National University, who was not involved with the study.<<

http://www.abc.net.au/news/science/2018-05-25/dinosaur-killing-asteroid-impact-global-warming-fossils-el-kef/9796244

Since dinosaurs are believed to have been great emitters of methane, it seems to me that this is more likely to have been the source of the climate change, rather than the asteroid impact.

So on that hypothesis the dinosaurs farted themselves to death.

The analogy with where we are going today seems even stronger.

You can either accept or discard knowledge, it would appear you prefer the latter.

PermeateFree said:

The Rev Dodgson said:

PermeateFree said:

An interesting paleoclimate study that changes the way we should possibly think about the dinosaur demise, with a warning of where we are going today.

>>Professor MacLeod’s team analysed the chemical composition of sand-grain-sized fragments of fish fossils embedded in the sedimentary layers below and above the Cretaceous-Paleogene boundary, signifying the 50,000 years preceding and 300,000 years after the collision.

When fish build minerals in their teeth, bones and scales, the temperature of the surrounding water dictates how much of a specific type or isotope of oxygen, called oxygen-18, is laid down.

In the El Kef fish fossils, he and his team found the signature of a rapid, intense rise in temperature from around 20 to 25 degrees Celsius, which was sustained for 100,000 years before dropping back to pre-collision levels.

And because of polar amplification, which tends to produce bigger climate swings near the poles than the equator, it’s likely the polar regions warmed even more than the 5 degrees calculated at El Kef, Professor MacLeod said.

You might have been taught that when the asteroid that killed the dinosaurs smashed into the Earth, fine particles were blasted into the atmosphere, blocking the sun and causing global cooling.

Even though this may have been the case in some parts, particularly close to the impact site, any local effects would have soon been swamped by overall global warming, said Andrew Glikson, a palaeoclimatologist at the Australian National University, who was not involved with the study.<<

http://www.abc.net.au/news/science/2018-05-25/dinosaur-killing-asteroid-impact-global-warming-fossils-el-kef/9796244

Since dinosaurs are believed to have been great emitters of methane, it seems to me that this is more likely to have been the source of the climate change, rather than the asteroid impact.

So on that hypothesis the dinosaurs farted themselves to death.

The analogy with where we are going today seems even stronger.

You can either accept or discard knowledge, it would appear you prefer the latter.

Thank you so much for your wise words. I shall treasure them for ever.

The Rev Dodgson said:

PermeateFree said:

The Rev Dodgson said:

Since dinosaurs are believed to have been great emitters of methane, it seems to me that this is more likely to have been the source of the climate change, rather than the asteroid impact.

So on that hypothesis the dinosaurs farted themselves to death.

The analogy with where we are going today seems even stronger.

You can either accept or discard knowledge, it would appear you prefer the latter.

Thank you so much for your wise words. I shall treasure them for ever.

It doesn’t worry me Rev, you can think what you like.

The Rev Dodgson said:

PermeateFree said:

An interesting paleoclimate study that changes the way we should possibly think about the dinosaur demise, with a warning of where we are going today.

>>Professor MacLeod’s team analysed the chemical composition of sand-grain-sized fragments of fish fossils embedded in the sedimentary layers below and above the Cretaceous-Paleogene boundary, signifying the 50,000 years preceding and 300,000 years after the collision.

When fish build minerals in their teeth, bones and scales, the temperature of the surrounding water dictates how much of a specific type or isotope of oxygen, called oxygen-18, is laid down.

In the El Kef fish fossils, he and his team found the signature of a rapid, intense rise in temperature from around 20 to 25 degrees Celsius, which was sustained for 100,000 years before dropping back to pre-collision levels.

And because of polar amplification, which tends to produce bigger climate swings near the poles than the equator, it’s likely the polar regions warmed even more than the 5 degrees calculated at El Kef, Professor MacLeod said.

You might have been taught that when the asteroid that killed the dinosaurs smashed into the Earth, fine particles were blasted into the atmosphere, blocking the sun and causing global cooling.

Even though this may have been the case in some parts, particularly close to the impact site, any local effects would have soon been swamped by overall global warming, said Andrew Glikson, a palaeoclimatologist at the Australian National University, who was not involved with the study.<<

http://www.abc.net.au/news/science/2018-05-25/dinosaur-killing-asteroid-impact-global-warming-fossils-el-kef/9796244

Since dinosaurs are believed to have been great emitters of methane, it seems to me that this is more likely to have been the source of the climate change, rather than the asteroid impact.

So on that hypothesis the dinosaurs farted themselves to death.

The analogy with where we are going today seems even stronger.

Perhaps they had similar stomachs and food processing abilities to cows and this was the case

I still cringe every time somebody says “Cretaceous-Paleogene boundary”. I know it’s correct, but for me it will always be the K-T boundary.

What’s so catastrophic about the boundary between the Paleogene and Neogene that qualifies it as a catastrophe similar in scale to the death of the dinosaurs?

Cymek said:

The Rev Dodgson said:

PermeateFree said:

An interesting paleoclimate study that changes the way we should possibly think about the dinosaur demise, with a warning of where we are going today.

>>Professor MacLeod’s team analysed the chemical composition of sand-grain-sized fragments of fish fossils embedded in the sedimentary layers below and above the Cretaceous-Paleogene boundary, signifying the 50,000 years preceding and 300,000 years after the collision.

When fish build minerals in their teeth, bones and scales, the temperature of the surrounding water dictates how much of a specific type or isotope of oxygen, called oxygen-18, is laid down.

In the El Kef fish fossils, he and his team found the signature of a rapid, intense rise in temperature from around 20 to 25 degrees Celsius, which was sustained for 100,000 years before dropping back to pre-collision levels.

And because of polar amplification, which tends to produce bigger climate swings near the poles than the equator, it’s likely the polar regions warmed even more than the 5 degrees calculated at El Kef, Professor MacLeod said.

You might have been taught that when the asteroid that killed the dinosaurs smashed into the Earth, fine particles were blasted into the atmosphere, blocking the sun and causing global cooling.

Even though this may have been the case in some parts, particularly close to the impact site, any local effects would have soon been swamped by overall global warming, said Andrew Glikson, a palaeoclimatologist at the Australian National University, who was not involved with the study.<<

http://www.abc.net.au/news/science/2018-05-25/dinosaur-killing-asteroid-impact-global-warming-fossils-el-kef/9796244

Since dinosaurs are believed to have been great emitters of methane, it seems to me that this is more likely to have been the source of the climate change, rather than the asteroid impact.

So on that hypothesis the dinosaurs farted themselves to death.

The analogy with where we are going today seems even stronger.

Perhaps they had similar stomachs and food processing abilities to cows and this was the case

And when the meteor stuck with that the generated heat, the methane laden air just went bang.

mollwollfumble said:

I still cringe every time somebody says “Cretaceous-Paleogene boundary”. I know it’s correct, but for me it will always be the K-T boundary.

What’s so catastrophic about the boundary between the Paleogene and Neogene that qualifies it as a catastrophe similar in scale to the death of the dinosaurs?

Reading this, it still doesn’t answer my question.

Whatever happened to the Tertiary and Quaternary?

It explains that the boundary between Tertiary and Quaternary has never properly been defined. Some options include 1.8 Ma, 2.6 Ma, 3.0 Ma, 3.6 Ma. OK, so it needed a firm definition. That still doesn’t explain what’s so fuckin special about the Paleogene/Neogene boundary that puts it on the same level as the death of the dinosaurs.

mollwollfumble said:

mollwollfumble said:

I still cringe every time somebody says “Cretaceous-Paleogene boundary”. I know it’s correct, but for me it will always be the K-T boundary.

What’s so catastrophic about the boundary between the Paleogene and Neogene that qualifies it as a catastrophe similar in scale to the death of the dinosaurs?

Reading this, it still doesn’t answer my question.

Whatever happened to the http://www.kgs.ku.edu/General/Strat/tertiary.html?

It explains that the boundary between Tertiary and Quaternary has never properly been defined. Some options include 1.8 Ma, 2.6 Ma, 3.0 Ma, 3.6 Ma. OK, so it needed a firm definition. That still doesn’t explain what’s so fuckin special about the Paleogene/Neogene boundary that puts it on the same level as the death of the dinosaurs.

A boundary is identified by worldwide geological deposits caused in this instance by the meteor strike.

This link may help with the Tertiary and Quaternary periods:

http://www.kgs.ku.edu/General/Strat/tertiary.html

mollwollfumble said:

mollwollfumble said:

I still cringe every time somebody says “Cretaceous-Paleogene boundary”. I know it’s correct, but for me it will always be the K-T boundary.

What’s so catastrophic about the boundary between the Paleogene and Neogene that qualifies it as a catastrophe similar in scale to the death of the dinosaurs?

Reading this, it still doesn’t answer my question.

Whatever happened to the Tertiary and Quaternary?

It explains that the boundary between Tertiary and Quaternary has never properly been defined. Some options include 1.8 Ma, 2.6 Ma, 3.0 Ma, 3.6 Ma. OK, so it needed a firm definition. That still doesn’t explain what’s so fuckin special about the Paleogene/Neogene boundary that puts it on the same level as the death of the dinosaurs.

>>>What’s so catastrophic about the boundary between the Paleogene and Neogene that qualifies it as a catastrophe similar in scale to the death of the dinosaurs?

>>>That still doesn’t explain what’s so fuckin special about the Paleogene/Neogene boundary that puts it on the same level as the death of the dinosaurs.

Where do you get this notion from?

Michael V said:

mollwollfumble said:

mollwollfumble said:

I still cringe every time somebody says “Cretaceous-Paleogene boundary”. I know it’s correct, but for me it will always be the K-T boundary.

What’s so catastrophic about the boundary between the Paleogene and Neogene that qualifies it as a catastrophe similar in scale to the death of the dinosaurs?

Reading this, it still doesn’t answer my question.

Whatever happened to the Tertiary and Quaternary?

It explains that the boundary between Tertiary and Quaternary has never properly been defined. Some options include 1.8 Ma, 2.6 Ma, 3.0 Ma, 3.6 Ma. OK, so it needed a firm definition. That still doesn’t explain what’s so fuckin special about the Paleogene/Neogene boundary that puts it on the same level as the death of the dinosaurs.

>>>What’s so catastrophic about the boundary between the Paleogene and Neogene that qualifies it as a catastrophe similar in scale to the death of the dinosaurs?

>>>That still doesn’t explain what’s so fuckin special about the Paleogene/Neogene boundary that puts it on the same level as the death of the dinosaurs.

Where do you get this notion from?

A quick check (because one never knows what important things one has missed in the literature) on Wikipedia doesn’t show this event.

https://en.wikipedia.org/wiki/Extinction_event