Uralo-Siberian languages
It was proposed in 1998 by Michael Fortescue,[1] an expert in Eskaleut and Chukotko-Kamchatkan, in his book Language Relations across Bering Strait.However, after 2011 Fortescue only included Uralic, Yukaghir and Eskaleut in the theory, although he argued that Uralo-Siberian languages have influenced Chukotko-Kamchatkan.Several more widely spread typologically significant features may also instead represent contact influence, according to Fortescue (1998): Apparently shared elements of Uralo-Siberian morphology include the following: Fortescue (1998) lists 94 lexical correspondence sets with reflexes in at least three of the four language families, and even more shared by two of the language families.However, Fortescue holds that Uralo-Siberian lies within the bounds of the provable, whereas Nostratic may be too remote a grouping to ever be convincingly demonstrated.Kortlandt (2006:3) considers that Uralo-Siberian and Altaic (defined by him as consisting of Turkic, Mongolian, Tungusic, Korean, and Japanese) may be coordinate branches of the Eurasiatic language family proposed by Joseph Greenberg but rejected by most linguists.