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Cerrig Duon stone circle
[750 x 620 jpg]

Submitted bypab
AddedJan 02 2008
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Description Newly split stones. Just north of Cerrig Duon, there are many split and/or splitting stones scattered around. Fascinated (but not very knowledgeable) as I am by geology, I particularly liked this one which had obviously come apart fairly recently, as the 2 parts fitted together perfectly.
I assume that the severe temperature changes up here mean that frost can get into the layers in the sedimentary rocks and eventually erode & split them apart? This one was about 1m long, in a stream near SN8441 2186

Posted Comments:

Thingy
(2010-03-26)
I have also found several stones in this area that I assume have been split by severe frosts, and the expansion of water in fissures when this freezes. They were higher up the slope toward Fan Brycheiniog. They all appeared to be very recent (found between 2007-2009) and I wonder if temperatures in this area are unusually low in these years. Cerrig has posted a fascinating example of an 'exploded' stone, here: http://www.megalithic.co.uk/modules.php?op=modload&name=a312&file=index&do=showpic&pid=54303&orderby=

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