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The 4 eras of geologic time( from ancient to recent )
Precambrian
Paleozoic
Mesozoic
Cenozoic
What developed in the Precambrian era?
The Canadian Shield
What developed in the Paleozoic era
The Appalachian mountains
Known as the age of the fishies
What developed in the Mesozoic era
The Rocky Mountains
Known as the age of reptiles
What developed during the Cenozoic era
The western cordillera, the Great Lakes
Known as the age of mammals