[quote="ryaner
Have to admit to sharing your mystification over what bullauns are and yes, this one, called a bullaun on archaeology.ie, is very suspicious. Were it a millstone, would the hole go right through? This doesn't. Also, the stone is an earthfast boulder, more square than round. A cross-base? Maybe, maybe not. The tall stone in this shot is a cross-base. Scalp looks more like this, a hole carved by army sappers to erect a flagpole.
So no, I'm not sure. Then again, I'm not sure why I bother trudging through muddy fields hunting out stones in the first place! :-)[/quote]

So...does anybody know what a bullaun is?

With regards to the millstone idea...it may have been who ever was carving it gave up before the job was finished..there may be a fault in the stone. As for cross bases..there is one on the moor near the Cheeswring here in sunny! Cornwall..not sure why it was left there but it has been identified as such. I know of another on the north of Bodmin Moor. They are just roundinsh stones with a hole cut in the middle.

How you identify which is which I am not the person to ask...

Mr H