7000 years ago – emergence of the first people on the native land.
4500-5000 years ago – the Brazen-Stone Age. People switch over to farming and cattle-breeding.
3000-3500 years ago – the Bronze Age period (tribes of Kazan).
VII - III centuries BC – early time of the Iron Age (tribes of Anan).
End of VIIth c – Beginning of VIIIth c – emergence of the early Bulgars on the middle Volga.