No, that stone's been in that position for hundreds of years, at least. It looks as though it was larger and has had bits break off it, certainly at the roadside end and perhaps off top too. There's been years of ewes grazing nearby as the transferred ruddle tupmarks suggest. (Excellent photographs !)
Two species of lichen were sent into space and exposed to the elements for fifteen days. It seems that they went into hibernation and woke up again when they were back on earth and in the lab. One of the species was Xanthoria, which will be a close relative of the yellow one on this Orcadian upright stone.
