Not only so, but the eastern migrations themselves, as above roughly outlined, appear to have taken place at a relatively late epoch, long after the inhabitants of West Siberia had passed from the New Stone to the Metal Ages. J. R. Aspelin, "founder of Finno-Ugrian archaeology," points out that the Finno-Ugrian peoples originally occupied a geographical position between the Indo-Germanic and the Mongolic races, and that their first Iron Age was most probably a development, between the Yenisei and the Kama, of the so-called Ural-Altai Bronze Age, the last echoes of which may be traced westwards to Finland and North Scandinavia. In the Upper Yenisei districts iron objects had still the forms of the Bronze Age, when that ancient civilisation, associated with the name of the "Chudes," was interrupted by an invasion which introduced the still persisting Turki Iron Age, expelled the aboriginal inhabitants, and thus gave rise to the great migrations first of the Finno-Ugrians, and then of the Turki peoples (Bashkirs, Volga "Tatars" and others) to and across the Urals. It was here, in the Permian territory between the Irtysh and the Kama, that the West Siberian (Chudish) Iron Age continued its normal and unbroken evolution. The objects recovered from the old graves and kurgans in the present governments of Tver and Iaroslav, and especially at Ananyino on the Kama, centre of this culture, show that here took place the transition from the Bronze to the Iron Age some 300 years before the new era, and here was developed a later Iron Age, whose forms are characteristic of the northern Finno-Ugrian lands. The whole region would thus appear to have been first occupied by these immigrants from Asia after the irruption of the Turki hordes into Western Siberia during the first Iron Age, at most some 500 or 600 years before the Christian era. The Finno-Ugrian migrations are thus limited to a period of not more than 2600 years from the present time, and this conclusion, based on archaeological grounds, agrees fairly well with the historical, linguistic, and ethnical data.