On the basis of regional, structural, and metamorphic studies combined with age determinations, it is demonstrated that the internal metamorphic fabrics of the main nappe sequence of Finnmark, northern Norway, developed during an Early Ordovician phase of the Caledonian orogeny (Grampian?); the cleavage development in the autochthon also belongs to this phase. The final mise-en-place of the thrust-nappe sequence, however, appears to belong to a later phase of Caledonian orogenic development, probably toward the end of the Silurian Period, as does the deformation and metamorphism of the Silurian sequence of Magerøy. The geochronological results also give information regarding the positioning of the lower boundaries to the Cambrian and Ordovician Systems.

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