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Interesting!
From Siencemags article -
https://www.sciencemag.org/news/2021/02/england-s-stonehenge-was-erected-wales-first
“Parker Pearson’s team then measured the last time sediments inside the socket holes at Waun Mawn had been exposed to light, using optically stimulated luminescence; they also radiocarbon dated charcoal found inside the pits. They estimate the missing stones were erected between 3400 and 3200 (BC) and then removed 300 or 400 years later, around the time the first construction at Stonehenge began,”

“Researchers say the dismantling of Waun Mawn and the rise of Stonehenge could have been part of a larger migration from the Preseli Hills to the Salisbury Plain. Human and animal remains found at Stonehenge have chemical signatures suggesting their early years were spent on the Welsh coast. “We’ve got regular contact between the two regions,” Pollard says.”