Earth's timeline

Earth TimelineEarth Timeline

When did these events occur?1. Find the length of masking tape at your table.2. Write Earth forms on one end of the tape, and

today on the other end. 3. As a group, place the following six events in

the timeline:a. Mammals first appearb. Amphibians first appearc. Fish first appeard. Birds first appeare. Reptiles first appearf. Dinosaurs first appear

What do these organisms have in common?

How old is the Earth?

Earth’s Calendar

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Earth forms from planetary nebula

today

HADEAN EONOf The Underworld

4.6 – 4.0 billion years ago

January 1 – February 17

ARCHEAN EONAncient Beginning

4.0 – 2.5 billion years ago

February 18 – June 16

fossil stromatolites

Banff, Canada

modern stromatolites Shark Bay, Australia

Banded Iron Formations

PROTEROZOIC EONEarly Life 2.5 billion – 542 million years ago

June 17 – November 18

eukaryotic cellprokaryotic cell

PHANEROZOIC EONVisible Life 542 million years ago – today

November 19 – December 31

PHANEROZOIC EON54

2 M

a

toda

y

AMPHIBIANS

370 MaDec 3

Oldest land fossil

440 Ma – Nov 28

MAMMALS

200 MaDec 16

DINOSAURS

231 MaDec 14

BIRDS

145 MaDec 20

REPTILES

310 MaDec 7

FISH

530 MaNov 20

MASS EXTINCTION 1

445 MaNov 27

MASS EXTINCTION 3

252 MaDec 12

MASS EXTINCTION 5

66 MaDec 27

MASS EXTINCTION 2

360 Ma Dec 4

MASS EXTINCTION 4

198 MaDec 17

Mass Extinctions54

2 M

a

toda

y

FISH

AMPHIBIANS

REPTILES

DINOSAURS

MAMMALS

BIRDS

CO2TCO2

TCO2

TCO2

T

CO2T

Change over time