It is estimated to have been spoken about 7,000 years ago somewhere in the American Northwest, possibly around the Columbia Plateau.
[2] Its main researcher was Paul Proulx.
In 1992, Paul Proulx theorized that Proto-Algic also possessed a phoneme *gʷ, which became *w in Proto-Algonquian and g in Wiyot and Yurok.
All stops and affricates in the above chart have aspirated counterparts, and all consonants, except fricatives, have glottalized ones.
Proto-Algonquian significantly reduced this system by eliminating all glottalized and aspirated phonemes.