Advertisement Upgrade to remove ads

Archaean Eon

Origin of Earth
Oldest known rocks on Earth's surface
Oldest fossils of cells (prokaryotes) appear
Concentration of atmospheric oxygen begins to increase

Proterozoic Eon/Ediacaran Period

Oldest fossils of eukaryotic cells appear/diverse algae and soft-bodied invertebrate animals appear

Cambrian Period

Sudden increase in diversity of many animal phyla (Cambrian explosion)

Ordovician Period

Marine algae abundant
Colonization of land by diverse fungi, plants, and animals

Silurian

Diversification of early vascular plants

Devonian

Diversification of bony fishes
First tetrapods and insects appear

Carboniferous

Extensive forests of vascular plants form
First seed plants appear
Origin of reptiles
Amphibians dominant

Permian

Radiation of reptiles
Origin of most present-day groups of insects
Extinction of many marine and terrestrial organisms at end of period

Triassic

Cone-bearing plants (gymnosperms) dominate the landscape
Dinosaurs evolve and radiate
Origin of mammals

Jurassic

Gymnosperms continue as dominant plants
Dinosaurs abundant and diverse

Cretaceous

Flowering plants (angiosperms) appear and diversify
Many groups of organisms, including most dinosaurs, become extinct at the end of the period

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set