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Are there moves of the Jastrof culture northward recorded by archeology? How come there is so much R1b U106 in Denmark?
If it originated in Netherland/ Northern Germany, then a culture must have spread it northward to Jutland.
What is even more confusing is that there was maybe Celts in Jutland as some consider the Cimbri a Celtic people.
There is also that Nordvestblock theory which consider that the area of Netherland/ Belgium/ North West Germany was neither Celtic nor Germanic.
U106 might have originated in this Nordwestblock with non Germanic tribes like the Cimbri or Belgae. I believe that U106 was Germanicized by I1 when Scandinavian tribes moved southward as the level of the Baltic sea raised.
By the way, both U106 and S116 eveloved from R1b L11 so they might have spoken a closely related language at some moment of history. As Germanic have the strongest non ie substratum, we can concude that this substratum was brought by I1 people( from he Nordic bronze age?) while U106 people probably spoke some sort of Para-Celtic language first.