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The shifting face of a 200-million-year-old mystery
BBC ^ | October 13, 2011 | Jason Palmer

Posted on 10/14/2011 6:33:24 AM PDT by decimon

Five times in the last half a billion years, tremendous, global-scale extinctions have wiped out a significant fraction of life on Earth - and each of them presents a grand puzzle.

The most recent and the most familiar is the extinction that wiped out the dinosaurs - between the Cretaceous and Tertiary periods, about 65 million years ago.

But before that, 205 million years ago, was the "End-Triassic Event" - it set the stage for the Jurassic Period, which saw the rise to prominence of the dinosaurs.

Just what happened that killed off half the species on the planet, though, remains a mystery.

>

Once upon a time, Paul Olsen of Columbia University's Lamont-Doherty Earth Observatory was one of the few people who believed that a giant impact of an object from space started the extinction, much like the impact that many people believe caused the demise of the dinosaurs.

>

But science has moved on. Other workers in the field have found in that same period, enormous lava flows from a flurry of volcanic activity in the then-developing Atlantic Ocean also occurred at exactly the same time.

>

(Excerpt) Read more at bbc.co.uk ...


TOPICS: History; Science
KEYWORDS: catastrophism; godsgravesglyphs; jurassic; triassic

1 posted on 10/14/2011 6:33:26 AM PDT by decimon
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To: SunkenCiv

Go with the flow ping.


2 posted on 10/14/2011 6:34:20 AM PDT by decimon
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To: decimon

It’s Bush’s ancestors fault.


3 posted on 10/14/2011 6:35:14 AM PDT by TribalPrincess2U (2012—They vote twice— we'll vote three times.)
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To: decimon

Heinsohn puts the flood about 3500 years ago.


4 posted on 10/14/2011 6:38:57 AM PDT by varmintman
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To: TribalPrincess2U

Lava flows from Bush’s Fault?


5 posted on 10/14/2011 6:41:43 AM PDT by Paladin2
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To: Paladin2

Sounds about right.


6 posted on 10/14/2011 6:46:23 AM PDT by TribalPrincess2U (2012—They vote twice— we'll vote three times.)
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To: decimon

I don’t want to know - stuff like this makes me dizzy;)


7 posted on 10/14/2011 6:55:13 AM PDT by sodpoodle (God is ignoring me - because He is watching you)
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To: decimon

What really happened was that Man (and women) were created when the Earth was created. They started building fires at night to cook the animals that they had killed during the day. The fire put evil carbon dioxide into the new, pristine atmosphere causing the Sun to heat things up which in turn killed the animals. Hence a mass extinction. Thus it has been thru the ages. Man and Woman have polluted the pristine Earth an eventually most of the animals (except those in the deep ocean and those in caves and under rocks) were killed off. We are in the 4th or 5th cycle. But not to worry, the protestors and the aging hippies will save the Earth and turn it into a paradise.


8 posted on 10/14/2011 7:08:55 AM PDT by Citizen Tom Paine (An old sailor sends)
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To: decimon

Just what happened that killed off half the species on the planet, though, remains a mystery


Why? I thought scientist had it all figured out.
99% of Scientist blame “Bush” (pear reviewed). However, of those who blame Bush 78% also blame Christians,Conservatives, Tea Partiers,racism and homophobia.


9 posted on 10/14/2011 7:13:17 AM PDT by Leep
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To: Citizen Tom Paine

“We are in the 4th or 5th cycle.”

Look up OOPARTS. Out Of Place ARTifactS. Kinda freaky. Many things are listed there, among them, people have found things in solid rock with no reasonable explanation of how they got there.


10 posted on 10/14/2011 8:45:32 AM PDT by ConservativeChris
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To: Leep
99% of Scientist blame “Bush” (pear reviewed). However, of those who blame Bush 78% also blame Christians,Conservatives, Tea Partiers,racism and homophobia.

I have often thought that with the emphasis of late on majority opinion / consensus being accepted as irrefutable fact, why aren't the scientists on the corner evangelizing? After all, clear majority position in the world is that God is real. So the scientists should bow to consensus and make their way to a church, right?

Oh, it doesn't work for God? Hmmmm.

11 posted on 10/14/2011 9:04:21 AM PDT by pepsi_junkie (Who is John Galt?)
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To: 75thOVI; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; Avoiding_Sulla; ...

Thanks decimon.




12 posted on 10/14/2011 5:27:35 PM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: decimon; StayAt HomeMother; Ernest_at_the_Beach; 1010RD; 21twelve; 24Karet; 2ndDivisionVet; ...

 GGG managers are SunkenCiv, StayAt HomeMother & Ernest_at_the_Beach
Thanks decimon.

To all -- please ping me to other topics which are appropriate for the GGG list.


13 posted on 10/14/2011 5:27:49 PM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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[1999 -- The letter of rejection from Nature for the following article is dated August 28, 1968. At the time most earth scientists would not even accept the fact that meteorites regularly impacted the earth. For example, Barringer Crater in Arizona was still thought by many to be of volcanic origin, as well as the craters on the moon. Bob Dietz had just published his work on shatter cones but I wouldn't say that had been generally accepted. There was not even general agreement on sea floor spreading and plate tectonics outside the radical few at Scripps, Woods Hole, and related institutions.]
Possible Formation of the Guatemala Basin by the Impact of an Extraterrestrial Body
by Charles E. Corry and Miller L. Bell
The earth must be as frequently cratered per unit area as the moon. By a relative cross section argument, more than 13 times the number of craters the size of the maria on the moon exist, or existed, on the earth. Whether such events occur with sufficient frequency in recent geologic time to provide tangible evidence today of such cratering is uncertain. From the arguments set forth, and the continuing discovery of meteorite craters on the continents (Short, 1966, Baldwin, 1963, Dietz, 1961, and Prouty, 1952) it seems likely that the importance of the effect of extraterrestrial bodies impacting the earth has been, at least, underestimated (the Alverez's hypothesis concerning the end of the dinosaurs by such a mechanism was more than a decade in the future). Certainly there is as much evidence at present to support our hypothesis for the formation of the Guatemala Basin as other hypotheses advanced to explain the low heat flow found in this basin.

With the tests for shock processes advanced by Short (1966), our hypothesis should be capable of field verification or rejection.

14 posted on 10/14/2011 5:28:59 PM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: decimon

Why are they spending all that money on finding the answer to this riddle when they could poll the scientists (all type of scientists) and reach a consensus?


15 posted on 10/14/2011 5:44:05 PM PDT by Mike Darancette (Psalm 109:8)
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To: ConservativeChris; SunkenCiv
This will succinctly explain the entire "mystery".


16 posted on 10/14/2011 6:37:10 PM PDT by ApplegateRanch ("Public service" does NOT mean servicing the people, like a bull among heifers.)
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To: decimon

If I recall correctly, indications of a very large impact crater partially on antarctica (subglacial today) have been found, the rest would be on the australian plate. Read this a few years ago here.


17 posted on 10/14/2011 6:56:15 PM PDT by WoofDog123
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To: ApplegateRanch

Maybe we’re kept alive by the luck of Teela Brown.


18 posted on 10/14/2011 7:18:30 PM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: WoofDog123

This one?
Two Catastrophe Scenarios
by William Corliss
About 2.2 million years ago, a chunk of space debris about a kilometer in diameter splashed down in the Bellingshausen Sea between Antarctica and South America. It was some splash! The splash zone was about 20 kilometers across, waves 4 kilometers high raced away from Ground Zero, and a column of salt water ascended miles high into the upper atmosphere. The TNT equivalent is estimated at 12 billion tons. Ice clouds formed and shaded the planet, causing severe climate changes. On the floor of the Bellingshausen Sea, 5 kilometers deep, lies the Eltanin Impact Structure.
Ocean splashdown
by Henry Gee
UC Davis Geology Department
An asteroid between one and four km in diameter that splashed into the Southern Ocean, 1500 km SW of Chile, just over two million years ago, may have worsened a period of global cooling that saw the emergence of modern humans... The impact in question was first discovered during a cruise of the Eltanin in the 1960s: betrayed by anomalously high amounts of iridium in ocean-bed cores... Gersonde and his colleagues have taken another look, their results coming from a cruise in 1995 by the research ship Polarstern. The impact left a distinctive 'signature' of geological layers, very like that of the Chicxulub impact. Lowest in the 'impact' sequence is a thick layer of disordered rubble, full of chunks of rock up to 50 cm across: this layer represents the large-scale disturbance immediately after the impact as the ten-megaton blast ripped up the ocean floor. This layer took around four hours to settle after the blast. Smaller particles, such as grains of sand, took longer to settle, explaining why this layer was found immediately above the rubble layer. Capping the whole sequence is a thin layer of very fine sediment, dispersed over a wide area. This would have contained fine-grained material (including vaporized asteroid) flung high into the air and which took days or months to settle out. This layer contained the iridium.

19 posted on 10/14/2011 7:28:58 PM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: decimon; SunkenCiv

Before somebody blames me, it was already like that when I got here.


20 posted on 10/14/2011 8:35:21 PM PDT by Salamander (Alice Cooper hit me with a stick.)
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To: decimon

I suppose it could therefore be argued that climate change caused by the entrapment of greenhouse gases is actually simply restoring the order to what the Earth should has always been - a growing band of uninhabitable land alone the equator, with increasingly violent storms in the rest of the world.

That is, if one were going to posit the existence of man-affected climate change.

But since that can never be done, it is far smarter to simply say that this man’s work is pure bunkum. Man’s behavior cannot affect the Earth’s atmosphere. Not only that, but there is no evidence that 1.) there was a huge extermination of aboriginal peoples as a result of Europe’s colonization of the Americas; 2.) that the peoples were responsible for the clearing of millions of acres of the North and South American continents; 3.) that forests such as the Amazonian are actually only 400 years old or so.

He better have some amazing evidence to back up all that conjecture.


21 posted on 10/14/2011 8:41:35 PM PDT by worst-case scenario (Striving to reach the light)
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To: ConservativeChris
Look up OOPARTS. Out Of Place ARTifactS. Kinda freaky.

That's one helluva fascinating subject. One of my favorites. For me, these out of place artifacts prove that we've barely scratched the surface of man's true history on this planet.

22 posted on 10/14/2011 8:42:35 PM PDT by Windflier (To anger a conservative, tell him a lie. To anger a liberal, tell him the truth.)
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To: worst-case scenario

Eh, wrong thread! Sorry!


23 posted on 10/14/2011 8:43:21 PM PDT by worst-case scenario (Striving to reach the light)
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To: ConservativeChris

There is a lot more to the history of the world than we are told.


24 posted on 10/14/2011 9:56:12 PM PDT by zeugma (Those of us who work for a living are outnumbered by those who vote for a living.)
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To: WoofDog123

Ooops, probably this one:

http://www.freerepublic.com/focus/news/1197396/posts
http://www.freerepublic.com/focus/bloggers/1248406/posts
http://www.freerepublic.com/focus/news/1641966/posts
http://www.freerepublic.com/focus/chat/1643681/posts


25 posted on 10/15/2011 4:48:00 AM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: Salamander

The premise of this is shifting face, and you shift with your foot, so I think you’re in the clear. ;’)


26 posted on 10/15/2011 5:10:09 AM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: SunkenCiv

http://www.freerepublic.com/focus/news/1641966/posts this one, yes, the first link of yours is a very recent impact.


27 posted on 10/15/2011 8:24:20 AM PDT by WoofDog123
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