Apart from morainic drift and paleozoic sediments - the latter ones resting on the sub-cambrian peneplain more than a thousand meters above sea-level -all the rocks in HoI (Hallingdal, Norway) are of pre-cambrian age. The youngest among them is the Hol granite, whioh cuts the "bottom gneiss", a migmatite consisting of different gneissic, gneiss-granitic and granitic components. It also cuts the so called dagaligneiss, which is a porphyritic or perhaps augengneissic rock, resting more or less conformably on the migmatite. The dagaligneiss is the oldest of the Telemark supracrustals in this region.