• Rb-Sr isotope systematics in the magmatic rocks of the Oslo rift. 

      Sundvoll, Bjørn; Larsen, Bjørn, T. (NGU Bulletin (418), Journal article, 1990)
      Fifty-one different units of Oslo Rift magmatic rocks have been investigated by the Rb-Sr isotope method. Isochron ages obtained for all but three of the units vary between 295 Ma and 240 Ma. The ages from the southern ...