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The best explanantion and the main reason is the different parent Mediterranean groups+ different PA influence, maybe:
Neolithic crania from southwestern Russia and the adjacent segment of Poland are not numerous, but are clearly differentiated racially. They belong to two types; a high-vaulted, moderately broad-nosed dolicho- to mesocephal, associated with short stature, 160 cm. or less, in the males. This type, which carries the Anau form to the west, is the most numerous, and is centered in the Volhyn district of the Ukraine. With it, in the Late Neolithic Fatjanovo culture, are associated a few brachycephals which, except for head form, differ little from the rest. This "Danubian" type is not basically different from some of the Lower Egyptian and Delta groups.
The second type, commonest in Late Neolithic cemeteries of the Kiev government, is of the tall (stature = 171-172 cm.), hyperdolichocephalic variety, usually leptorrhine and high-vaulted, which we have called "Corded." Crania of this variety are actually few in number, and probably Late Neolithic in date. Metrically, they resemble the earliest Sumerian skulls at el 'Ubaid.
The Corded crania are larger than any from Egypt, and are metrically very similar to the Elmenteita skulls from East Africa - the two groups could be combined without loss of homogeneity. In Mesopotamia, they may be favorably compared with the three dynastic skulls from Ur, although they are higher vaulted than the other early groups.
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