This is a protoconlang, not to be confused with the hypothetical, reconstructed Proto-Altaic. Cf. Earth'.
|Labial|| Dental /
|Fricativs||f||s||ʂ ~ ʃ|
[ʃ] occurs before front vowels, [ʂ] elsewhere.
CV(N), maybe other codas too?
/NN Nf Nl/ do not occur. /ʈ/ does not occur initially and has been argued to have rather been /d ~ ɖ/.
Vowels come in a set of nine: /i ɪ e ɛ a ɔ o ʊ u/ plus the semi-difthongs /ej aj aw ow/ (/ɛj ɔj/ have also been proposed by these are much less secure). Some reconstructible alternations between the "lax" /ɪ ɛ ɔ ʊ/ and "tense" /i e o u/ occur, for the mid vowels in several cases conditioned by the presence of a following /a/.
Splits to Proto-West Altaic' and Proto-East Altaic' around -4.5ka.