Hypothetical Proto-Greek area of settlement (2200/2100–1900 BC) suggested by Katona (2000), Sakellariou (2016, 1980, 1975) and Phylaktopoulos (1975)View about "Proto-Greek area" in the 3rd millennium BC, reconstructed by Vladimir I. Georgiev (1973 & 1981). The boundaries are based on the high concentration of archaic Greek place-names in the region in contrast to southern Greece which preserves many pre-Greek.[6][7] Modern consensus is that pre-Proto-Greek and other IE languages split from PIE only after 2500BC, with proto-Greek forming in the proto-Greek area during the Early Helladic III period (c. 2200–2000 BC).[8]
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^Georgiev 1981, p. 156: "The Proto-Greek region included Epirus, approximately up to Αὐλών in the north including Paravaia, Tymphaia, Athamania, Dolopia, Amphilochia, and Acarnania), west and north Thessaly (Hestiaiotis, Perrhaibia, Tripolis, and Pieria), i. e. more or less the territory of contemporary northwestern Greece)."
^A comprehensive overview is in J. T. Hooker's Mycenaean Greece (Hooker 1976, Chapter 2: "Before the Mycenaean Age", pp. 11–33 and passim); for a different hypothesis excluding massive migrations and favoring an autochthonous scenario, see Colin Renfrew's "Problems in the General Correlation of Archaeological and Linguistic Strata in Prehistoric Greece: The Model of Autochthonous Origin" (Renfrew 1973, pp. 263–276, especially p. 267) in Bronze Age Migrations by R. A. Crossland and A. Birchall, eds. (1973).