The Eidsfjord shear zone, Lofoten-Vesterålen, north Norway: An Early Devonian, paleoseismogenic low-angle normal fault

► Describes northern terminous of one of Earth's best exposed post-orogenic detachment systems. ► Traces Caledonian (Sil-Dev) through Modern extensional evolution of the Norwegian margin. ► The Eidsfjord detachment is interpreted to be an exposed ancient low-angle normal fault. ► Abundant psuedotachylyte indicates that it is an ancient seismogenic low-angle normal fault. ► Results have implications for understanding seismogenesis during low-angle normal faulting.