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danescombeModerator
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Megaflood 'made Island Britain'
      #950598 - 07/18/07 10:46 AM

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Megaflood 'made Island Britain'

Britain became separated from mainland Europe after a catastrophic flood some time before 200,000 years ago, a sonar study of the English Channel confirms.

The images reveal deep scars on the Channel bed that must have been cut by a sudden, massive discharge of water.

Scientists tell the journal Nature that the torrent probably came from a giant lake in what is now the North Sea.

Some event - perhaps an earthquake - caused the lake's rim to breach at the Dover Strait, they believe.

Dr Sanjeev Gupta, from Imperial College London, and colleagues say the discharge was one of the most significant megafloods in recent Earth history, and provides an explanation for Britain's island status.

"This event or series of events that caused [the breach] changed the course of Britain's history," Dr Gupta told BBC News.

"It made it an island separated from continental Europe. It happened at the White Cliffs of Dover - so symbolic for Britain's identity - and it was the creation of those White Cliffs that actually made Island Britain." rest of article




Some event, or combination of events, resulted in a huge lake breaching the chalk ridge between what is now Dover and Calais. Scars from the torrent are still evident in sonar images of the Channel floor today, presented (above) as a processed 3D perspective view

Edited by danescombe (07/18/07 10:47 AM)


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TheLedgeModerator
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Re: Megaflood 'made Island Britain' [Re: danescombe]
      #950625 - 07/18/07 11:13 AM

I blame all the cavemen for driving 4x4's around

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simon_a
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Re: Megaflood 'made Island Britain' [Re: TheLedge]
      #951424 - 07/19/07 11:50 AM

Cavemen?

You sure it wasn't cavewomen, driving their cavechildren to caveschool...?



Simon.

Edited by simon_a (07/20/07 01:53 AM)


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BeadieJayModerator
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Re: Megaflood 'made Island Britain' [Re: simon_a]
      #951438 - 07/19/07 12:08 PM

Quote:

Cavemen?

You sure it wasn't cavewomen, driving their cavechildren to school...?



Simon.




ahem, I very nearly didn't approve this post - pretty close to the mark young man!!!!!

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HillModerator
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Re: Megaflood 'made Island Britain' [Re: danescombe]
      #951692 - 07/19/07 10:19 PM

This sort of "megaflood" is the same process that formed the channeled scablands in the eastern Washington state in the USA.

From the Los Angeles Times:

Quote:

The months-long gushes of water cut through the island's chalky land bridge to Europe "like a buzz saw through Styrofoam," said Steven Dutch , a geologist at the University of Wisconsin-Green Bay who was not associated with the study.

The mega-floods broke through at the present Straits of Dover, the narrowest part of the channel, leaving the white cliffs of Dover where the bridge once began.

"That land bridge had been there for 13 million years," said Philip Gibbard, a geologist at the University of Cambridge, who was not part of the study.

The researchers' map of the seabed found a valley that was miles wide and more than 150 feet deep in some places. They also saw scour marks, layers and islands carved in the rock, said Sanjeev Gupta, lead author of the study and a geologist at Imperial College London.

Gupta compared the features with those of the Scablands in eastern Washington state — a scarred region covering thousands of square miles, comprising deep, dry canyons, giant holes and scattered boulders.

The region is a geological example of a landscape formed by mega-floods. The Scablands floods took place thousands of years ago, when glacial lakes in Idaho drained into the area. To a geologist, the most striking feature of the Scablands is the ripples.

"This looks just like what you'd see in a stream, but it's scaled up 100 times," Dutch said. "There are places where you can see ripple marks that are 50 feet crest to crest."

The bottom of the English Channel has similar features that could only come from a giant flood, the scientists said.

The researchers surmised that the source of the flooding was a lake in the region of the modern North Sea that overflowed because advancing glaciers blocked water from draining elsewhere.

The water poured out at a rate of more than 250 million gallons per second, the scientists said.




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simon_a
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Re: Megaflood 'made Island Britain' [Re: BeadieJay]
      #951817 - 07/20/07 01:52 AM

I very nearly didn't post it...



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danescombeModerator
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Re: Megaflood 'made Island Britain' [Re: simon_a]
      #952393 - 07/20/07 03:42 PM

Thanks Hill -for the info and comparison.

This idea was floated at University in the early 1990's --Its good to see supporting evidence.

I remember posting This Post when i first joined BBS.---

3D View of Dry Falls

Wiki Info

Edited by danescombe (07/20/07 03:50 PM)


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