PIE of course wasn't ergative, and even Pre-PIE was IMHO active-stative rather than ergative.Terra wrote:Here ( http://www.kortlandt.nl/publications/art247e.pdf ), Kortlandt says:The rise of the ergative construction, grammatical gender and adjectival agreement can be attributed to North Caucasian influence and may have proceeded as indicated by Pedersen (1907).
This makes sense. IE is something like "Para-Uralic" on a Caucasian substratum. Uralic clearly is the more conservative of the two branches of Indo-Uralic (if Indo-Uralic is a thing at all, of course), and in most of the points where IE differs typologically from Uralic, it resembles NWC and/or Kartvelian.Terra wrote:He also says:claims that Proto-Indo-European itself already consists of two unrelated groups of elements, which he calls A and B (1933, 1934a, 1937b). Here A contains pronouns, verbal roots and derivational suffixes whereas B contains isolated words which are not related to verbal roots, such as numerals, some kinship terms, and many names of body parts, animals and trees. Uhlenbeck compares A with Uralic and Altaic and attributes irregular features such as heteroclitic inflection and grammatical gender to B, for which one might think of Caucasian languages. The relation between Indo-European and Uralic can be extended to Eskimo (cf. Uhlenbeck 1905a, 1906, 1907, 1934b, 1937a,
The chariot probably indeed played a role in IE expansion. But why do you attribute Indo-Iranian to a western lobe? Did you mean "eastern"? Also, I think Italic and Celtic are IMHO "northern lobe" languages related to Germanic. I see three main dialect groups within Late PIE:TaylorS wrote:It is interesting to note that the chariot was invented by IE speakers sometime around 2500 BC, which is also when they started expanding significantly out of the steppes. A northern lobe of expansion became the Corded Ware culture, from where Germanic, Balto-Slavic, and Tocharian emerged. A southern lobe gave rise to the Hellenic, Celto-Illyrian, Italic, and Armenian subfamilies, and a western lobe became Indo-Iranian.
1. Northern - Italic, Celtic, Germanic, Balto-Slavic
2. Tocharian
3. Southern - Greek, Armenian, Indo-Iranian