Structure

The metamorphic rocks of the Koettlitz area have been folded into a number of broad anticlines and synclines of several mile amplitude. Northeast of the central granitic mass the bedding attitudes and fold axes strike predominantly northwest-southeast, normal to the coastline and into the granites, this trend continuing as foliation in the granitic bodies. The trends become more nearly east-west in the central and southwestern portions, but their interpretation is progressively more tenuous. The beds are steeper and in some cases overturned. Minor plications are characteristic structures in the Salmon Marble, especially near its contact, with schist and paragneiss.

High angle faults cut the basement rocks in many places; their displacement could generally not be determined except where they offset the lamprophyres.