What of Buxton, Rice and Penniman? Have they been discredited over the years or are they still regarded well enough.
One may then look for similarities between Sumerian and Austric languages. This study has in fact been already done and the consensus is a resounding, yes. The austric languages are indeed similar to ancient Sumerian. The similarities are so numerous and clear that they are beyond doubt or a result of any chance coincidence. (The Austric Origin of the Sumerian Language, Language Form, vol. 22, no.1-2, Jan.-Dec. 1996.)
Therefore now it may be said with confidence that ancient Sumerian is not a linguistic isolate. It belongs to the australoid/ austric group of languages. They belong to this group because the ancient tribal people of Indian west coast also belonged to the same group of people, and it is from here that they must have migrated to Mesopotamia. Both the Australoid and Austric type are found in India. There are clear reasons to rule out any other location for the Sumerian migration: Western India is geographically close to Southern Mesopotamia as compared to south East Asia and Australia and there are no know instances of civilization east of the Indus valley around five thousand years ago. Such evidence has been found in the Indus valley.
The second study concerns physical examination of Sumerian skulls. Buxton and Rice have found that of 26 Sumerian crania they examined 22 were Australoid or Austrics. Further According to Penniman who studied skulls from other Sumerian sites, the Australoid Eurafrican, Austric and Armenoid were the "racial" types associated with the Sumerians. Here is Penniman's description of the Austric type found at Sumer:
"These people are of medium stature, with complexion and hair like those of the Eurafrican, to which race they are allied with dark eyes, and oval faces, broad noses, rather feeble jaws, and slight sinewy bodies."
Good to have your informed opinion on the subject Jaylemurph.