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Ancient fires drove large mammals extinct, study suggests

nytimes.com

111–120 of 137 posts

Re: Ancient fires drove large mammals extinct, study suggests

#111

Seems that Younger Dryas Impact Hypothesis might fit these observations too. "We obtained radiocarbon dates on 172 specimens from seven extinct and one extant species... spanning 15.6 to 10.0 thousand calendar years before present (ka)." YDIH event is estimated at 12900 BP and includes vast wildfires in its scenario, including in North America. Contrast that with the idea that humans have been in Sapiens form for 200…

impacts were an effect, not the cause

Re: Ancient fires drove large mammals extinct, study suggests

#112

Seems that Younger Dryas Impact Hypothesis might fit these observations too. "We obtained radiocarbon dates on 172 specimens from seven extinct and one extant species... spanning 15.6 to 10.0 thousand calendar years before present (ka)." YDIH event is estimated at 12900 BP and includes vast wildfires in its scenario, including in North America. Contrast that with the idea that humans have been in Sapiens form for 200…

Not directly related but I recall watching a "documentary" on Discovery where this guy claimed that several monuments across the globe all matched up star patterns and similar astrological events from around 12k years ago IIRC. What I recall best was some pyramids ligning up with how the stars would have been back around that time, but they've since drifted apart. He also talked about Angkor Wat and some in South Ame…

These days you can find information supporting any theory so take this link with a grain of salt but I found this and believe it relates to your recollection.

https://coolinterestingstuff.com/mysterious-alignment-of-anc...

Re: Ancient fires drove large mammals extinct, study suggests

#113
post #29

Earlier quoted context omitted.

And yet, for some reason, ancient humans decided not to eat all the elephants. No, it was climate change. The last, small population of mammoths that survived until 4000 years ago on Wrangel Island never came in contact with humans. They died because they were ill suited for the climate they lived in.

You do realize that the majority of elephant species are extinct and the ones left have less than a fraction of their historic range?

This is a bit of a tangent, but I think the phrase "you do realize" rarely, if ever, seems to add anything to the debate. It sounds patronising at best, and makes people defensive even if it's a useful point.

Re: Ancient fires drove large mammals extinct, study suggests

#114

Earlier quoted context omitted.

Are you maybe thinking of Ancient Aliens? I remember an episode like that, IIRC it also had some crazier claims like pyramid complexes resembling calculator circuit boards.

Can't recall, though from what I recall it wasn't that out there. What I do recall was that the main point was that these monuments were linked to something astrological, be it stars, equinoxes or similar, "that the same time" some 12k years ago. That's why I thought of it in this context. If it were true, and the timing lining up with these big animals going away, did something big happen 12k years ago? Of course, n…

> If it were true, and the timing lining up with these big animals going away, did something big happen 12k years ago?

An ice age ended, and humans invented agriculture. Combined, these are very big things for the world. Magic/aliens not required.

Re: Ancient fires drove large mammals extinct, study suggests

#115

Earlier quoted context omitted.

Can't recall, though from what I recall it wasn't that out there. What I do recall was that the main point was that these monuments were linked to something astrological, be it stars, equinoxes or similar, "that the same time" some 12k years ago. That's why I thought of it in this context. If it were true, and the timing lining up with these big animals going away, did something big happen 12k years ago? Of course, n…

> If it were true, and the timing lining up with these big animals going away, did something big happen 12k years ago? An ice age ended, and humans invented agriculture. Combined, these are very big things for the world. Magic/aliens not required.

Yeah wasn't suggesting aliens by any means.

Re: Ancient fires drove large mammals extinct, study suggests

#116
post #89
post #9

I'd be highly skeptical of this claim. Large megafauna around the entire world began dying off both before and after the last glacial maximum, even in areas where there wasn't a significant human presence. The fact that they died off in North America around that time, too, isn't that surprising. It's also worth noting that at that time, a large part of North America was covered in savanna, which is among the most hig…

There have also been large finds with many dead megafauna together. It is not expected that humans at that time had the ability to slaughter very large numbers of megafauna all together.

> It is not expected that humans at that time had the ability to slaughter very large numbers of megafauna all together.

It is very much expected, and well documented.

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

Re: Ancient fires drove large mammals extinct, study suggests

#117

Earlier quoted context omitted.

You do realize that the majority of elephant species are extinct and the ones left have less than a fraction of their historic range?

This is a bit of a tangent, but I think the phrase "you do realize" rarely, if ever, seems to add anything to the debate. It sounds patronising at best, and makes people defensive even if it's a useful point.

[flagged]

Re: Ancient fires drove large mammals extinct, study suggests

#118

Seems that Younger Dryas Impact Hypothesis might fit these observations too. "We obtained radiocarbon dates on 172 specimens from seven extinct and one extant species... spanning 15.6 to 10.0 thousand calendar years before present (ka)." YDIH event is estimated at 12900 BP and includes vast wildfires in its scenario, including in North America. Contrast that with the idea that humans have been in Sapiens form for 200…

Humans could have lived nicely in harmony for hundreds of thousands of years in times of abundance, and when sudden cataclysms caused great famines or suffering they could have resorted to more drastic measures that caused large scale fires. Doesn’t mean this is what I think happened, but sounds just as plausible as comets causing havoc to me. In the end IMO this field has been greatly disserviced by Hancock. The yDI…

Just for the record, Hancock has never promoted aliens. He's dead wrong a great deal, but not that wrong. His crime, though, is to have been annoyingly right too many times, for all the wrong reasons. YDIH is just one such case.

Hancock's great strength is that he actually goes to all the places he writes about, and his wife takes great pictures. I forgive all his maundering in exchange for the pics.

Re: Ancient fires drove large mammals extinct, study suggests

#119
post #75
post #4

Earlier quoted context omitted.

The fire hypothesis is compatible with what you said. The idea is that humans either directly or indirectly caused frequent and vast wildfires that destroyed ecosystems, and those fires either killed animals directly or destroyed the resources they needed to survive.

Not really? Megafauna disappeared everywhere in Americas, including in the Central and South America, that are not susceptible to massive wildfires. It's far more likely that people simply poked animals to death with sharp sticks.

It is completely impossible that people drove all these animals extinct with sharp sticks. People lived in the Americas for thousands of years without affecting them noticeably, and then they all disappeared suddenly, 30+ genera strong, along with the Clovis people.

We know from polar ice cores that the Americas were shrouded in dense smoke 12,800 years ago from fires started by the comet strikes at that specific time. Central and South America are certainly susceptible to massive wildfires, like anywhere shrouded with combustibles.

Re: Ancient fires drove large mammals extinct, study suggests

#120

Earlier quoted context omitted.

Are you maybe thinking of Ancient Aliens? I remember an episode like that, IIRC it also had some crazier claims like pyramid complexes resembling calculator circuit boards.

Can't recall, though from what I recall it wasn't that out there. What I do recall was that the main point was that these monuments were linked to something astrological, be it stars, equinoxes or similar, "that the same time" some 12k years ago. That's why I thought of it in this context. If it were true, and the timing lining up with these big animals going away, did something big happen 12k years ago? Of course, n…

Absolutely something big happened 12800 years ago: a massive comet strike that melted much of the North American ice sheet and started continent-wide wildfires. The record is seen unambiguously in a spike of massively elevated platinum dust, and sulfur from fires, frozen into a layer of polar ice.

30+ genera of, mostly, big mammals went extinct suddenly, along with the Clovis culture.

The big remaining mystery is what happened 1200 years later to end the Younger Dryas cold spell.

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