Abstract

The Old Red Sandstone of the Hornelen district, western Norway, forms part of a major fold-terrane, and the principal magnetization is associated with the Late Devonian to Early Carboniferous Svalbardian/Solundian Orogeny. The present fault margins of the Hornelen Massif, claimed by various authors to represent subordinate Devonian splay faults associated with megashearing in the North Atlantic or lateral ramps in a regional extensional tectonic setting, are shown to be post-Devonian structures, and the present outline of the Hornelen Massif is a Mesozoic (Jurassic) ‘graben’.