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EraTime

Millions of Yrs Ago

Began — Ended

Major Geological EventsMajor Biological EventsCanadian Landforms Created
Precambrian

(earliest life)

4600      570

– volcanoes erupted, many cycles of mountain building and erosion– 1st single-celled organisms

– 1st multi-celled organisms

– Canadian Shield formed

Paleozoic

(ancient life)

570        245– periods when large parts of North America were covered by shallow seas– 1st insects

– Age of Amphibians and Fish

– large swamps

– 1st plants & animals appear on land

– Appalachian Mountains formed

Mesozoic

(middle life)

245        66– shallow seas in interior of North America at times– Age of Reptiles (dinosaurs)

– 1st flowering plants

– 1st birds and mammals

– Formation of Rocky Mountains begins

– Innuitian Mountains formed

Cenozoic

(recent life)

66     present– ice sheets covered much of North America

– continents take on present shape

– human beings develop

– Age of Mammals

– modern forms of life evolved

– Formation of Rocky Mountains completed

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