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21 Cards in this Set
- Front
- Back
|
earliest homo
|
tertiary period
@4mya |
|
|
first apes
|
tertiary period
65-2mya |
|
|
first whales
|
tertiary period
65-2mya |
|
|
first horses
|
tertiary period
65-2mya |
|
|
extinction of dinosaurs
|
KT boundary
65mya |
|
|
first placental mammals
|
cretaceous period
100mya |
|
|
first birds
|
jurassic period
175mya |
|
|
first mammals
|
triassic period
225mya |
|
|
first dinosaurs
|
triassic period
225mya |
|
|
first mammal-like reptiles
|
carboniferous period
300mya |
|
|
first reptiles
|
carboniferous period
300mya |
|
|
first amphibians
|
devonian period
375mya |
|
|
first insects
|
devonian period
375mya |
|
|
first land plants
|
devonian period
375mya |
|
|
first fish with jaws
|
silurian period
425mya |
|
|
first shelled organisms
|
cambrian period
500mya |
|
|
first multicellular organisms
|
precambrian period
550mya and older |
|
|
first bacteria
|
precambrian period
550mya and older |
|
|
origin of life
|
precambrian period
550mya and older |
|
|
oldest rocks
|
precambrian period
550mya and older |
|
|
formation of the earth
|
4.5bya
|
