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Tiny creatures reveal ancient sea levels

Updated - 1/9/2010 - abc news online.

 

Tiny marine creatures found on the seabed on opposite sides of West Antarctic give a strong hint of the effects of sea level rise, say scientists.

The discovery of very similar colonies of bryozoans, animals that anchor themselves to the seabed, in both the Ross and Weddell Seas are a clue that the ice sheet once thawed and the seas were once linked, they say.

West Antarctica holds enough ice to raise world sea levels by between 3.5 and 5 metres if the sheet collapsed. Some scientists believe it may have vanished during a natural warm period within the last few hundred thousand years.

"It was a very big surprise," says David Barnes, lead author of the study at the British Antarctic Survey, of the find of similar bryozoans 2400 kilometres apart in seas on either side of the West Antarctic ice sheet, which is 2 kilometres thick.

 

www.abc.net.au/science/articles/2010/09/01/2999453.htm

 

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