Ice Pancakes near the River Dee near Balmoral Castle?

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Jamie Urqhart/River Dee Trust

Several strange frozen saucers were found during a recent cold snap near the River Dee -- a salmon-filled waterway that passes by the British Queen's summer residence, Balmoral Castle, before heading eastwards to the coastal city of Aberdeen.

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Jamie Urqhart/River Dee Trust

River Dee Trust biologist Jamie Urquhart made the discovery. The Trust was initially unsure what caused the pancakes, but suspects they're caused by a rare phenomenon in which foam freezes in a swirling eddy.

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Jamie Urqhart/River Dee Trust

The Trust said it's the first time the pancakes, more commonly found in the Antarctic or the Baltic Sea, have been seen on the River Dee.
end quote from:
http://www.ksbw.com/national-news/ice-pancakes-baffle-experts/30298400

I haven't been to visit Balmoral Castle but I have stayed with friends who live in Aberdeen for about 1 week in October 2011.