Earth Time Line

By: Hannah Patterson

The Big Bang

3,500 Precambrian Era

3,000

Earliest fossil bacteria

2,500

Origin of Oxygen by photosynthesis

1,500

First eukaryote, and early eukaryote

1,000

Diverse protists

700

Earliest multicellular organism

600 Cambrian Period

500 Ordovician Period

Origin of all major animal phyla, and animal diversity abounds; first jawless appear

440

First mass extinction, plants and arthropods invade land

440- 410

Silurian Period

410

Bony fishes become abundant

370 Devonian Period

Early amphibians

350

Early reptiles

360

Second mass extinction

360-290 Carboniferous Period

280-250 Permian Period

250

Third mass extinction

240-210 Triassic Period

The first dinosaurs and mammals

200

Fourth mass extinction

200-150 Jurassic Period

150-75 Cretaceous Period

Appearance of flowering plants

70

Dinosaurs become extinct

65 Paleogene Period

Mammals take the dinosaurs place

60-40

Birds and mammals become more abundant

40

Primates appear in trees

25-10 Neogene Period

Hominis descend from the trees

20

Mammals become more abundant on land

15- today Quaternary Period

15

Appearance of Australopithecus

2

Ice ages begin to grip the world

.5

First homo sapiens

Today

Modern humans are born