>>I've certainly not heard of exactly that form in Ireland. Sounds most odd.

A couple of things though. The Hound of Hostages was a cairn covered with a clay layer. Newgrange was built in several phases. Phase one was a low mound. The next couple of phases raised the mound around the passage. There was enough of a pause between phases to allow grass to cover the mound.<<

Love that typo, I wish there was an Irish Wolfhound sitting outside it, it could certainly do with a Guardian ;-)

Seriously though, Knowth is layered, the bit they let you in shows it clearly, although at the time I didn't think to ask if all the material was local or brought from elsewhere. If you're up that way anytime, please can you make a note of exactly what it is layered with and let me know?

Also, years ago, I read an excavation report on 'Primtomb' and some of the tombs at Carrowmore, in which it said for at least two tombs and I think it was Primtomb 1 and 2 but my memory is like a sieve and I can't find the report now :-( the ground had been deliberately flattened then there was a layer of yellow clay not local to the area placed with care then the construction of the covering took place. Maybe I've mis-remembered, it's highly possible.

I think it may have something to do with bringing clay from another revered area, but there's such scant info so far, it may not be of any relevance at all...

>>As to your actual question, I've never heard of any collection of that information.<<
Fingers crossed there might be some somewhere.

Rune