4.56 Billion Years

Earth Forms

4.4 Billion Years

Oldest mineral grain found

4.1 Billion Years

Oldest piece of rock ever

found

3.9 Billion Years

Oldest evidence of a continent

3.8 Billion Years

First evidence of life

3.5 Billion Years

First Fossils

(Algae & Bacteria)

1.8 Billion Years

Free O₂ in atmosphere

1.1 Billion Years

First fossil of a complex

organism

(a worm)

540 Million Years

First abundant life found in the rock record

460 Million Years

First Fish

440 Million Years

First Land Plants

410 Million Years

First Land Animals

250 Million Years

Largest Mass Extinction

247 Million Years

First Dinosaurs

240 Million Years

First Mammals

220 Million Years

Break-up of super continent Pangaea begins

145 Million Years

First Flowering Plants

65 Million Years

Dinosaurs and other animals go extinct

30 Million Years

Mammals/Flowering plants become abundant

5 Million Years

Beginning of Cascade

Volcanic Arc

1.8 Million Years

First primate in genus

 Homo

40,000 Years

First Homo sapiens

13,000 Years

Humans first inhabit North America

10,000 Years

End of last Ice Age

8,000 Years

Founding of Jericho, the first known city

2,000 Years

Roman domination of

the World

500 Years

European rediscovery of the Americas

~34 Years

Humans first explore the

moon