Recent glottochronologists have dated the split of Proto-Balto-Slavic into its daughter languages between 1300 and 1000 BCE, which suggests that the Komarov and Chernoles cultures would have been Proto-Slavic.
Into the Common Era, the various Balto-Slavic dialects formed a dialect continuum stretching from the Vistula to the Don and Oka basins, and from the Baltic and upper Volga to southern Russia and northern Ukraine [REF].