berun
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After looking the maps for L21, U152, DF27, U106 it's absolutely normal to link each subclade with know ancient cultures (per example Irish/Q-celts, P-Celts/Italics, Iberians/Basques, or Germanics)... but taking into account history, it's possible to map these subclades how would be 2000 years ago: French Britanny was colonized by Britons fleeing from invading Saxons, Germanic Saxons were invading Great Britain after crossing the sea like Germanic Franks were occupying mainly the north of France after crossing the Rhine (the same was done by the Alamani but in Alsace); Vascones were also pushing inside France founding a new country (Wasconia > Gascony)... so 2000 years ago the subclades L21, DF27 and U106 most problably coincided with geographic barriers (the sea, Pyrenees, Rhine), and that would imply that the area occupied by such subclades by then were not determined so much by ethnics but by barriers. The main exception would be to explain why U152 is not taking into account the Alps, but there are also known historical causes to explain it: Hallstadt Celts invaded Noth Italy around XII bC, creating there the Canegrate/Golasecca Cultures which led to the Lepontian language, and by IV bC some Gaulish tribes crossed the Alps, so that North Italy was known as Cisalpine Gaul. The Villanovan Culture of Tuscany also had strong ties with Hallstadt, but the language that dominated there was Etruscan, maybe by their superior civilization.
So geographic barriers are determining important R1b subclades (but also geographic barriers can determine language's areas).
A little problem about this thinking about geographic barriers is the presence of U106 in both Scandinavia and Germany; the sea barrier is not so strong as there are many islands in between, but it could be supposed by statistical means that U106 developed somewhere in Germany (there were more people living in Germany than in Scandinavia, so the possibilities to have the U106 mutations was bigger in Germany). The presence of U106 in Scandinavia could be explained as that it was carried along indoeuropeanization, possibly led by R1a Corded Ware people.
So geographic barriers are determining important R1b subclades (but also geographic barriers can determine language's areas).
A little problem about this thinking about geographic barriers is the presence of U106 in both Scandinavia and Germany; the sea barrier is not so strong as there are many islands in between, but it could be supposed by statistical means that U106 developed somewhere in Germany (there were more people living in Germany than in Scandinavia, so the possibilities to have the U106 mutations was bigger in Germany). The presence of U106 in Scandinavia could be explained as that it was carried along indoeuropeanization, possibly led by R1a Corded Ware people.