Cambrian
Geologic time period when dinosaurs dominated
age of reptiles
Paleozoic
The geologic time period when the biodiversity of life exploded
current era
mass extinction in the Permian period was possibly the result of
climate change due to continental drift
Quaternary
The present time period
The oldest geologic era
Jurassic
Paleozoic Mesozoic Cenozoic
Cenozoic
The eras of the Geologic Time Scale
Geologic Time Scale
Mesozoic Era
a record of the life forms and geologic events in Earth's history
