Spent quite a while sat contemplating the stone inside the chamber, and whilst it is a most singular stone, I can't say unequivocally that it is a fossilised tree, i've got some at home too, and its definitely wood, but the stone could just be stone that looks like wood, some of the Callanish stones have a woody look to them.
Are the cut marks in the stone supposed to be from when it was wood or are they cut into the stone, and is it generally known which one.
If it is a fossilised tree, are there any more examples, I know Stoney Littleton has ammonites but, I cant think of any fossilised wood being used anywhere, so the chances of it not being wood are greater than the chances of it being wood.
I'm not convinced.
Could be though, Dammit Jim I'm a Postman not a Geologist.