Tectonic setting within northwestern Europe. This map has been compiled after Ziegler (), Vejbæk and Britze (), Lokhorst (), Pharaoh (), Baldschuhn et al. (), Sigmond () and Maystrenko et al. (Maystrenko et al. ). The location of the Årvollskogen borehole, Line 1 and the Magnus-Rex deep seismic line 3 from Stratford et al.  (magenta line) are also shown. LTZ - Lithospheric Transition Zone and STZ - Sorgenfrei-Tornquist Zone.