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arcylon
07-04-2005, 11:05 PM
I've just posted the location of some strange circular lakes in the random files section. Anybody know what they are?

http://www.googleearthhacks.com/forums/downloads.php?do=file&id=51

Mickey
07-05-2005, 07:29 PM
Wow, good find. I have no idea what they are, but maybe someone else will be able to help out.

GeoDave
07-05-2005, 07:48 PM
The circular depressions are thermokarst lakes formed by melting permafrost. There is a useful account of these at:

http://users.skynet.be/ougseurope/surface/thermokarst.html

arcylon
07-05-2005, 07:51 PM
Thanks very much! Thought they might have been maars, but they're too widespread. Looks like permafrost does some interesting stuff!

Mickey
07-05-2005, 08:46 PM
Nice work, GeoDave! I've edited the listing on that file (http://www.googleearthhacks.com/forums/downloads.php?do=file&id=51) to include this new information.

Mickey