Hmmm, so it was once stood upright? Well, that puts it in the same class of rocks which includes ( http://www.themodernantiquarian.com/site/339/devils_arrows.html ). Those are rough northern examples but a similar principle perhaps ...
I stumbled across this yesterday:
http://ads.ahds.ac.uk/catalogue/adsdata/fyfod/html/fwp66.html
Not had time to read it all yet, but after a quick skim through looks like it's got some great info! Might print it off and read it on the way home tonight...
This thread's thrown up some really interesting stuff - cheers for sharing, guys!
G x
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