The Neolithic Period in Borrowdale - A history by Andy Warner
Dating from the Late Neolithic period – around
2,500BC – the circle comprises some 38 stones with an
additional 10 stones forming a small rectangular setting,
“The Sanctuary”, located in the eastern quarter. The
underlying rock of the site is Skiddaw Slate, but the stones
themselves are of volcanic origin. And that is pretty much
the extent of our actual knowledge of the Circle
More at
https://www.nationaltrust.org.uk/borrowdale-and-derwent-water/documents/castlerigg-stone-circle.pdf
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