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245
Mezoic
Geo: Formation of rockies start, Innnuitan mountains done, shallow seas in earth interior of north america Bio: Reptile age, flowering plants and first mammals and birds -
570
Paleozoic
Geo: large parts of North America are covered by shallow seas and Appalachians formed Bio: Amphibians,fish , insects(born) first ever swamps, coal and plants and animals on land -
Cenozoic
Geo: ice sheets cover most of north america, continents take present shape, rocky mountains done Bio: human beings develop, age of mammals and evidence of modern forms of life -
Precambrian
Geological: Precambrian shields (i.e Canadian Shield, Braziallian Shiled, African Shield) are created. Biological: Single and multi celled organisms are created