There is a new pre-publication paper on the Altar Stone, with a 2019 date attached. Details as follows:
Alternative Altar Stones? Carbonate-cemented micaceous sandstones from the Stonehenge Landscape
Here is the URL:
As fellow bloggers will know, we have spent a lot of time on this blog pondering on the origins of the Altar Stone, and on the relationship of the stone itself with assorted samples claimed to have come from it. One of the biggest mysteries relates to "sample 277" -- assumed but never proved to have come from the stone:
In an earlier post I said this:
The big issue here is the amount of garnet among the heavy minerals in the rock. Herbert Thomas and Richard Thomas have both stated that there are substantial amounts of garnet in the Altar Stone itself -- but garnet is missing from thin section 277. There are also substantial amounts of garnet in the Cosheston Beds. So was HH Thomas right all along? And have Ixer and Turner simply assumed that thin Section 277 was correctly labelled, when it might have just come from a piece of debitage assumed -- unreliably -- to have come from the Altar Stone?