New geochronological data on the Lower and Upper Proterozoic complexes of the Sub-Polar Urals are presented, where the outcropping Precambrian section in the Lyapin anticlinorium is the stratotype for the entire Timan-Northern Urals region. The author’s version of the stratigraphic scheme for Pre-Palaeozoic formations in the study area is proposed. It is shown that unlike the Bashkir anticlinorium in the Southern Urals, with a complete section of the Upper Proterozoic, our region has no Lower and Middle Riphean deposits. Taking into account the new data on the isotope age of zircons from the Precambrian formations from the various parts of the Timan-Northern Urals region, it is argued that that during the entire Early Riphean and most or all of the Middle Riphean the northeastern margin of the Baltic was outside the zone of marine sedimentation. That is, chronologically, the Timan continental margin was laid down near the boundary of the Middle and Upper Riphean.