Geologic time
Cenozic
Current era
age of mammals
largest mammals/humans
period of ice climate change
Paleozic
"Early life"
formation of pangea
life developing quickly
Cambrian explosion of life
forming mountians
Mezoic
"Age of reptiles"
mammals and birds appeared
ended in mass extinction
increased complex life
precambrian
Oldest and longest
90 percent of Earth's history
simple lifeforms (one celled)
organisims,bactiria,jelly fish