21st June 2009, 04:02 PM
Cramp has been found on the Shetlands or Orkney, but can't remember pricesly which (report was from the 1930s). I do wonder, as already mentioned, if this is lightning strikes. There is a useful Powerpoint presentation here:
http://www.geog.unt.edu/~maxey/files/lef...Strike.ppt
The picture of the fulgurite/fulgar.
http://www.geog.unt.edu/~maxey/files/lef...Strike.ppt
The picture of the fulgurite/fulgar.