hypothetical nuclear area contains the homelands of four proto-languages
(shaded). It is hypothesized that farming dispersed processes
led to the later distribution of the following language families:
(1) Afro-Asiatic, (2) Elamo-Dravidian, (3) Indo-European, (4)
Altaic. It should be noted that the hypothetical Nostratic macro-family
contains all four language families and that the homeland indicated
may be the homeland of proto-Nostratic around 10,000BC.
Renfrew 1991: 13; reproduced by permission of the author and
Cambridge University Press.