The results of 27 new potassium-argon age determinations on alkaline rocks from Söröy, Seiland, and Stjernöy are presented. These fall into two major groups, i.e. 480-491 m.y. and 384-420 m.y., which are thought to correspond with two major phases of the Caledonian orogeny.
The age of alkaline rocks from West Finnmark, Northern Norway, and their bearing on the dating of the Caledonian Orogeny