Anyone know what this squiggly rock is?
We found this rock whilst out on a family walk on the edge of Salisbury Plain. It has what appears to be rusty squiggles over the surface of the rock, but they don't pentrate the rock at all. We had fun trying to guess what it is, whether it's natural or possibly man made - http://s44.photobucket.com/user/catheri ... t=3&page=1
Anybody got any idea?!