I had associated the presence of deer herding as likely happening during the Bronze Age and assumed more recent activity as merely continuity. This makes that idea unlikely at all. first we learn that deer husbandry was intact in Ireland until 1150 AD and disappeared with their herders. The advent of cattle followed the monks.
What this clearly does is anchor the Norse control of the Gulf Stream route at the same time as the Norse discovered America around 1000 AD. This was soon taken over by the Templars until long past Columbus.