Rocks of latest Precambrian and Eocambrian age have been mapped along the Gudbrandsdalen valley from Lillehammer in the south to Vinstra in the north. They are made up by a series of conglomerates, sandstones, shales, and limestones. They are partly overlain by Cambro-Ordovician deposits in the RingebuVinstra district. Most of the beds are autochthonous or parautochthonous, but allochthonous sedimentary rocks occur in the Ringebu-Vinstra district together with crystalline rocks of the Caledonian overthrust massifs ('Jotun nappc'). In the whole area the main strike direction is a bo ut east-west; N 110g E - 130g E within the Ringebu-Vinstra district.