The geologic events preserved in the Canadian Shield took place mainly during the
A)Archean eon.
B)Paleozoic era.
C)Phanerozoic eon.
D)Mesozoic era.

Question

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The Canadian Shield, one of the world's largest geologic continental shields, primarily features rocks and geologic events from the Archean eon, which spans from about 4 billion to 2.5 billion years ago. This period is known for the formation of the Earth's first solid crust and the earliest known life forms.

The Geologic Events Preserved in the Canadian Shield Took Place