Long-lost fragment of Stonehenge reveals rock grains
dating to nearly 2 billion years ago. live Science, Aug. 4, 2021
[www.livescience.com]

The open access paper is:

Nash DJ, Ciborowski TJR, Darvill T, Parker Pearson M, Ullyott
JS, Damaschke M, et al. (2021) Petrological and geochemical
characterisation of the sarsen stones at Stonehenge. PLoS ONE
16(8): e0254760. [doi.org]
[journals.plos.org]

Related articles are:

Once-Missing Piece of Stonehenge Could Reveal
Where Iconic Standing Stones Were Quarried
Tom Metcalfe, Live Science, May 9, 2019
[www.livescience.com]

Analysis of returned Stonehenge core sample helps explain
megalith's durability by Bob Yirka , Phys.org, Aug. 5, 2021
[phys.org]

Geological analysis explains durability of Stonehenge
megaliths, Will Dunham, Reuters, Aug. 5, 2021
[www.reuters.com]

Yours,

Paul H.

"The past is never dead. It's not even past."
William Faulkner, Act 1, Scene III, Requiem for a Nun (1951)