The Developed Swiderian appeared with their migrations to the north and is characterized by tanged blades: this stage separates the northwestern European cultural province, embracing Belgium, Holland, northwest Germany, Denmark and Norway, and the Middle East European cultural province, embracing Silesia, Brandenburgia, Poland, Lithuania, Belarus, Western Russia, Ukraine and the Crimea.

It has been generally accepted that most of the Swiderian population emigrated at the very end of the Pleistocene (10,000 BP uncalibrated; 9500 BC calibrated) to the northeast following the retreating tundra, after the Younger Dryas[citation needed].

Sorokin (2004) rejects the "contact" hypothesis of the formation of Kunda culture and holds it originated from the seasonal migrations of Swiderian people at the turn of Pleistocene and Holocene when human subsistence was based on hunting reindeer.

However, a preliminary connection to early North Norwegian settlements is contradicted by the shape of the tanged points and by the blade reduction technology from Sujala.

The bifacially shaped tang and ventral retouch on the tip of the arrowpoints and the pressure technique used in blade manufacture are rare or absent in Ahrensburgian contexts, but very characteristic of the so-called Post-Swiderian cultures of Western Russia.