Talk:Pingo

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This page: http://en.wikipedia.org/wiki/Pingo

provides the old traditional description of how these structures are formed on land by heaving of water ice from permafrost.

Recent work (2003) observing them -- underwater -- suggests that may be an error: http://www.mbari.org/news/news_releases/2003/paull_pingos.html

"... the gas emerging from the submarine pingos appears to be nearly pure methane. This suggests that it did not originate from a natural gas reservoir that lies deep below the sea floor in this area. In addition, water in the submarine pingo cores is only half as salty as water in the surrounding sediments, suggesting that it came from buried freshwater ice rather than from the overlying seawater.

"... none of these early data conclusively proves that the gas and fresh water in the pingos originated in methane hydrates. However, the circumstantial evidence is very suggestive. ...."

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