| In Nærøyfjord the underlying rocks are anorthosite and gabbro, and softer phyllite. |
| It is composed of gneiss and migmatite that contain minor lenses of schist, marble, phyllite and quartzite. |
| It is underlain primarily by Ordovician metasedimentary strata, mainly phyllite, metaquartzite, and metagreywacke. |
| Most commonly, fragments of metamorphic rocks such as slate, phyllite, or schist predominate, producing phyllarenite. |
| The bedrock is folded and faulted phyllite, quartzite, argillite, slate and limestone of the lower Paleozoic Cariboo Group. |
| It is underlain by schist, phyllite, and quartzite, although outcrops of serpentine are common in the area. |
