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Tectonic element map of North America

Canada, that is the old Canadian Shield in the centre, and the younger additions surrounding it, started to grow from at first smaller pieces of land not long after our planet Earth had been born about 4,600 million years ago (4,600 Ma).
The oldest rocks found on Earth are dated at about 4,000 Ma and are exposed in the western Northwest Territories, in the Slave Province, one of the older "Archean cratons" from which the Canadian Shield eventually was formed.

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