
Originally Posted by
parastais
Also from Petri Kallio:
Diversification of Proto-Finnic
“ As a matter of fact, the Finnic speech area was probably even more restricted to the coastal areas than his map suggests, because As a matter of fact, the Finnic speech area was probably even more restricted to the coastal areas than his map suggests, because it was not until the second century AD that typical tarand graves spread from coastal Estonia to inland Estonia as well as northern Latvia (Lang 2007: 191–203), thus causing the separation of Inland Finnic (> South Estonian) and Gulf of Riga Finnic (> Livonian)”
If this is how it, then Southern Route becomes rather doubtful hypothesis, despite its attractiveness..