@ProfLouiseL thank you! That it all appears to have stopped abruptly makes it all the more interesting. I'm more familiar (in a very small sense) with #Newgrange #BruNaBoine but the #Orkney site opens even more questions.

for #StandingStoneSunday a pic I took at #Newgrange #BruNaBoine in #Ireland in October. It was a beautiful day. This stone stands out from the Newgrange passage tomb, overlooking the River Boyne in #CountyMeath