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What Caused the Dinosaur Extinction?

MULTIZ321

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What Caused the Dinosaur Extinction?
By Bianca Bosker/ Science/ The Atlantic/ theatlantic.com

"The Nastiest Feud in Science
A Princeton geologist has endured decades of ridicule for arguing that the fifth extinction was caused not by an asteroid but by a series of colossal volcanic eruptions. But she’s reopened that debate.

Gerta keller was waiting for me at the Mumbai airport so we could catch a flight to Hyderabad and go hunt rocks. “You won’t die,” she told me cheerfully as soon as I’d said hello. “I’ll bring you back.”

Death was not something I’d considered as a possible consequence of traveling with Keller, a 73-year-old paleontology and geology professor at Princeton University. She looked harmless enough: thin, with a blunt bob, wearing gray nylon pants and hiking boots, and carrying an insulated ShopRite supermarket bag by way of a purse.

I quickly learned that Keller felt such reassurances were necessary because, appropriately for someone who studies mass extinctions, she has a tendency to attract disaster. Long before our 90-minute flight touched down, she’d told me about having narrowly escaped death four times—once while attempting suicide, once from hepatitis contracted during an Algerian coup, once from getting shot in a robbery gone wrong, and once from food poisoning in India—and this was by no means an exhaustive list. *

Keller had vowed not to return to India after the food-poisoning debacle. But, never one to avoid calamity, she’d traveled to Mumbai—and gotten sick before her plane had even landed; an in-flight meal had left her retching. Keller was in India to research a catastrophe that has consumed her for the past 30 years: the annihilation of three-quarters of the Earth’s species—including, famously, the dinosaurs—during our planet’s most recent mass extinction, about 66 million years ago. She would be joined in Hyderabad by three collaborators: the geologists Thierry Adatte, from the University of Lausanne; Syed Khadri, from Sant Gadge Baba Amravati University, in central India; and Mike Eddy, also from Princeton. They picked us up at the airport in a seat-belt-less van manned by a driver who looked barely out of his teens, and we began the five-hour drive to our hotel in a town so remote, I hadn’t confidently located it on a map.


Where I looked out our van’s window at a landscape of skeletal cows and chartreuse rice paddies, Keller saw a prehistoric crime scene. She was searching for fresh evidence that would help prove her hypothesis about what killed the dinosaurs—and invalidate the asteroid-impact theory that many of us learned in school as uncontested fact. According to this well-established fire-and-brimstone scenario, the dinosaurs were exterminated when a six-mile-wide asteroid, larger than Mount Everest is tall, slammed into our planet with the force of 10 billion atomic bombs. The impact unleashed giant fireballs, crushing tsunamis, continent-shaking earthquakes, and suffocating darkness that transformed the Earth into what one poetic scientist described as “an Old Testament version of hell.”....."

1920.jpg

Illustration by Denise Nestor



Richard
 
Thanks Richard, a very nice read. Long but concise. Global warming, folks is not fake news it is happen to our planet right now. IMHO.
 
Maybe they are both right.

Consider:

Honking big asteroid hits Earth. Lots of dust waves, ect. But nobody seems to consider what happens to Earth's overall planetary geology. That's a lot of energy absorbed by the Earth from the impact. Lot's of BIG shockwaves go though the Earth. They blow open a weak spot (the Deccan Traps), causing a lot of stuff to get ejected, causing even more damage, before the the weak spot finally closes. Adios all sorts of life. . .

You see, the question behind the question is, why the near time correlation between the two? I suspect that it wasn't a coincidence. . .
 
The real reason for dinosaur extinction...
dinosaurs-noahs-ark-oh-crap-today.jpg
 
I liked that Talent312. The dinosaurs could not fix on the Ark.
Now that is logical. :doh:
 
Were Dinosaurs Killed Off By Asteroid or Volcanoes? It's Complicated
By Ivan Couronne/ Other Sciences/ Archaeology & Fossils/ Physics.org/ phys.org

"Every school child knows the dinosaurs were killed off by an asteroid smashing into the Earth some 66 million years ago.

But scientists say the story may not be quite that simple, and that massive volcanic eruptions over hundreds of thousands of years may have contributed to the dinosaurs' demise at the end of the Cretaceous period.

Two studies published Thursday in the journal Science contributed to a longstanding scientific debate about what exactly finished off the mighty reptiles.

Before the 1980s, the dominant theory had been that huge and prolonged volcanic eruptions caused a rapid and deadly shift in the planet's climate by sending vast clouds of ash, gas and dust into the atmosphere.

Then scientists discovered the huge Chicxulub crater of an ancient asteroid impact off the Caribbean coast of Mexico, which they posited had sent so much debris into the atmosphere that it hampered photosynthesis in plants and killed off three-quarters of life on Earth.

Ever since, scientists have maintained a lively debate about the relative contribution of each cataclysmic event to the mass die-off.

The authors of the two reports published Thursday were able to date massive lava flows with far greater precision, whittling it down from around a million years to a period of tens of thousands of years.

"We are able to recreate with great precision the order of events at the end of the Cretaceous period," Loyc Vanderkluysen, a professor of geoscience at Drexel University in Philadelphia, told AFP.

He was part of a team that dated the vast lava flows known as the Deccan Traps in India using radiation measurements. The other team used a different dating method....."

dinosaurskel.jpg

Dinosaur skeletons on display at Tokyo's Science Museum


Richard
 
Okay, in my best Cliff Clavin voice, Boston accent and all...

Well Normy, there was definitely a mass extinction event 65 million years ago, and it did spell the end for most dinosaur species. But not all.
Today’s birds evolved from dinosaurs, which makes them every bit as much of a dinosaur as T. rex or Triceratops. Take the bat for example. Bats are a weird type of mammal that developed wings and the ability to fly. Also, birds are simply a weird type of dinosaur that did the same thing. ;)

Set us up another round Sam.
 
I've loved dinosaurs since I was a young kid, then gravitated more toward archaeology. Closest I could get to archaeology as a UCLA undergrad was anthropology. Ended up with a double major in anthropology and geography. Then of course I spent my 20s and early 30s in the accounting world after going back to school for classes to help me get a paying job (then we bought a window covering franchise and I did that for 30 years). I married Cliff when I was 29, oblivious to his family background which he'd "left behind" in spite of still being in loving contact with his family. I was 34 when there was an article in the LA Times one Sunday morning. "Did you know there are people who don't believe in dinosaurs, let alone Australopithecus and Homo Habilis?" I asked. Then he let me in on the dirty little secret of his Southern Baptist upbringing! Somehow in my insular Los Angeles non-churchgoing upbringing (in spite of 4 years of Catholic high school) and four years studying anthropology at UCLA, it had never crossed my notice that there were "non-believers"! God just planted those dinosaur bones, according to my in laws.
 
I've loved dinosaurs since I was a young kid, then gravitated more toward archaeology.
No dinosaurs in my childhood. But they have been popular with kids forever, and I wonder why? They aren't cuddly. Some would eat you. They are ugly. The toys tend to be rigid. Maybe they unleash the inner roar in people?
 
No dinosaurs in my childhood. But they have been popular with kids forever, and I wonder why? They aren't cuddly. Some would eat you. They are ugly. The toys tend to be rigid. Maybe they unleash the inner roar in people?
Barney may differ with that. :ponder:
 
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