Biology Eras and Time Periods

Precambrian (Era)

Oldest era, first prokaryotes appeared, then photosynthetic prokaryotes, followed by eukaryotes, and finally multicellular eukaryotes.

Paleozoic (Era)

Era dominated by marine life. Had the Cambrian explosion, and included the Ordovician, Silurian, Carboniferous, and Permian periods.

Mesozoic (Era)

Dinosaur's era, split of Pangea occurred, early birds and mammals came into existence.

Cenozoic (Era)

The modern Era, including the Paleogene and Neogene periods.

Cambrian (Period)

Had namesake explosion

Ordovician (Period)

Exhibited mostly aquatic life and had geologic changes

Silurian (Period)

Aquatic life thrived here, coral reefs and jawed fish, first terrestrial animals and plants

Devonian (Period)

Age of the Fish

Carboniferous (Period)

Formation of Pangea, WARM time, amphibians dominant

Permian (Period)

Huge extinction took place, transitioning into mesozoic era.

Triassic (Period)

First early dinosaurs appeared, along with early mammals, birds, and cone plants

Jurassic (Period)

Age of the dinosaur, reptiles thrived, split of Pangea

Cretaceous (Period)

Continued dinosaur life, ended in EXTINCTION by huge meteorite.

Paleogene (Period)

Composed of Paleocene, Eocene, Oligocene epochs, age of mammals

Neogene (Period)

Current period, containing the Miocene, Pliocene, Pleistocene, and Holocene epochs, primates evolving

Holocene

Birth of civilization and written history

Hadean (Eon)

4.6 BYA -4.0 BYA

no rock record

earth surface hot molten , asteroid impacts, volcanoes

hades, hell

Periods in order

Hadeon, Archaeon, Proterpzoic