After seeing this this weekend I think I have changed my mind...in the entrance to a small Methodist Chapel in Elnor, Derbyshire.

http://img.photobucket.com/albums/v239/slumpy_uk/elnor%20lane%20chapel%20stones/moto_0041.jpg
http://img.photobucket.com/albums/v239/slumpy_uk/elnor%20lane%20chapel%20stones/moto_0043.jpg

How cool is that?

And these two-what-used-to-be-one who refuse to be parted, even after millenia of erosion down middle, leaving a perfectly parellel channel 6" wide between the two. Underneath Castle Naze Hillfort.

http://img.photobucket.com/albums/v239/slumpy_uk/castle%20naze%20hillfort/moto_0031.jpg
http://img.photobucket.com/albums/v239/slumpy_uk/castle%20naze%20hillfort/moto_0032.jpg

There are several other 'pairs' scattered to the west of the fort where the cliff falls away in a similar state, a superb lesson in weathering and erosion for my boy :)