The author analyses craniological materials obtained from the burial ground Tiskino (XI–XX cc. A.D.) and Aldyigan (XI–XIII cc. A.D.), on the territory of the Naryim Ob basin. Mediaeval populations as well as those close to that of modern times represent one and the same anthropological type typical of the present Naryim Selcoupes. Genetically, it is related to the former population of the Kulajsky archaeological culture which, in its turn, reveals racial-genetic ties with a Mongoloid component in the number of the populations of the Bronze Age present in the series obtained from the burial grounds Yelovka 2 and Chernoozerye 1 of the Andronovo cultural entity, as well as in the craniological series from the Krotovo burials of the burial ground Sopka 2. This combination of anthropological signs evolved in the South West Siberian Tertiary centre of racial origin.