Potassium-argon age determinations on rocks from St Kilda and Rockall

Abstract

Synopsis St Kilda intrusive rocks have yielded the following ages: Post-granophyre dykes and sheets 35 m.y. (approx.) Granophyres and associated sheets 56 m.y. Dolerites and basic sheets 60 m.y. Eucrite ?60 m.y. + A sample of aegerine-granite from Rockall has provided an age of 60±10 m.y.