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
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.