The Lønset anticline in the Opdal area

It is made reasonable that the basal gneiss in spite of the conformity is older than the granulite and of archean age. A conglomerate is found in a highly deformed condition between the flagstone and the gneiss. In an undeformed condition it occurs as an inclusion in the Gråhø saussurite gabbro. It contains inter alia fragments of the basalgneiss displaying its normal foliation. Since the gabbro is of Cambro-Silurian age, the conclusion must be that the conglomerate separates an arcean gneiss of pre- Caledonian foliation from the Sparagmitian granulite.