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The Park lands lie over the igneous rock base of the Precambrian Shield — also known as the Canadian Shield, so extensive is its expanse over this country. A long process that included uplifts, glaciation, erosion and sedimentation slowly fashioned the landscape of the Park today: rolling hills, occasional flatlands, bare rock or thin soils, naked escarpments and an abundance of marshes, lakes and streams.
The most common rock throughout the area is syenite, closely followed by crystalline calcium (marble) and striated gneiss, all of Precambrian origin.
The panoramic views that can be seen from the higher summits enable us to understand the action of the faults, through the contrast between the sedimentary lowlands and the high, igneous plateau.