Just watched the video clip twice, extremely interesting indeed. At first, when it was said that wood can petrify (in certain circumstances) in a century I started to wonder about the monolith being a wooden support used in the construction of the barrow.
When I looked at it the second time, I wondered what type of stone it is (or is meant to be) excuse my ignorance on this as I have not yet been to Angelsey (its on my list). In a north Wilthsire town there are loads of large stones lying around, some of them are sarsens but a significant number are sandstone which tend to have a rougher surface; it is also much softer in terms of 'working it'.
I do have a piece of fossilized wood; it is very irregular in both colour and texture.
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