This is especially interesting since it is at the same place, and perhaps the same time the 5 MILLION members of the Lost Tribes of Israel penetrated the Causasus Mountains, NE of the Black Sea, and where the CELTS suddenly appeared in history. Sounds like there is a great language story to be discovered here somewhere.
I went to your site and read this. I don't believe this and just did not want to confront you with that information. lol
"The area where Proto-Indo-European was originally spoken"
Was a "plain in the land of Shinar" (Mesopotamia).
"Go to, let us go down, and there confound their language,
that they may not understand one another's speech.
11:8 So the LORD scattered them abroad from thence upon the face
of all the earth" (Genesis 11:)
Unless Indo-European was a branch split off from that original language of the Tower of Babel, in which case it might have begun in the Caucasus Mountains.