Paleozoic
|
Cambrian
|
Ordovician
|
Silurian
|
Devonian
|
Carboniferous
|
Permian
|
|
|
Age of
invertebrates
|
First fish appear ( jawless
fish)
|
Age of fish, first land
plants appeared, first land
arthropods
|
First amphibians, insects
developed.
|
First reptiles, ice covered a
large part of the earth, great coal forming
forests.
|
Major extinctions occurred,
first cone bearing plants and ferns.
|
|
Mesozoic
|
Triassic
|
Jurassic
|
Cretaceous
|
|
|
Age of Reptiles. First
dinosaurs, first mammals
|
Rocky mountains rise, first
birds, largest dinosaurs thrive.
|
First flowering plants,
dinosaurs die out, first placental
mammals.
|
|