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In the old theories about the Germanic ethnogenesis there were two basic assumptions:
1. The cradle of the Germans laid in the North (Southern Scandinavia/Northern Germany) during the Iron Age
Jastorf Culture
2. There was a kind of Germanic unity.
Based on recent theories, based on recent studies about archeology, philogy and genetics we can correct this:
* Based on name giving of places and rivers and so fort the cradle of the Germanic language/culture lays in central (middle) German area:west of the Elbe river, North of the Aller river and the Ore mountains;
* The push for developing the Germanic culture came from the Bronze Age
Unetice culture (2300-1600 BC), this culture had a severe impact on the development of the
Nordic Bronze Age (1750-500 BC), during this period the West Indo European language developed into Germanic, Celtic, Italic;
* Bronze age warriors and traders moved (roll over?) from central Germany to Northwest Europe genetically this ment a blend between Y-DNA R1b-21, I1 (probably paleothic) and R1a (Corded Ware) into a Germanic genetic mixture;
* The Bronze age "big men" culture meant long distance trade, marriages and a kind of aristocratic attitude (marked graves), 'well groomed' by copying "razor blades" Mycean style, there where close relations between for example "big men" from Jutland and the North German plain;
* Within this broad umbrella the were some differentiation in tribes and genetics (for example: the founder effect of R1b S21 was in the Western Germanic tribes bigger) and in language/dialect take for example the rune development in the North.
In short: the Germanic ethnogenesis was earlier (Bronze Age in stead of Iron Age) and more central Germanic than hitherto (19th/20th century) thought.
Literature
Wolfram Euler, Sprache und Herkunft der Germanen (Hamburg/London 2009)
Maciamo Hay,
http://www.eupedia.com/europe/Haplog...shtml#S21-U106
Kristian Kristiansen and Thomas B. Larsson, The rise of the Bronze Age society (Cambridge 2005)