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