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The Precambrian Heartland

Geological time table.

You find the ages of the heartland of the Canadian Shield in the bottom, old part of the table, and of the younger ones in its upper part, and, on the map we just saw, toward the edges of the continent.
The oldest continental crust originally was transformed from colliding plates of oceanic crust which eventually became stable cratons, the foundations of a growing continent. The North American craton is one of the oldest, and probably the largest, craton in the world. Its core is the heartland of our continent.

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