Alexis Geologic Timeline

Beginning of Earth

4500 BCE

Temperature: 8000F
Comets forming the Earth.
Earth was molten.

Water was beginning to form on Earth

4400 BCE

Starting to cool and solidify.

Earth is covered in water vapor

4000 BCE

Water world: 90% (green oceans and iron)
Atmosphere: CO2 (thick and red)

Continents began to form

3400 BCE

Oceans become dominated.
Granite appears. (salt water + basalt)

Granite Planet

2500 BCE

Continents formed everywhere.
Species dominated: Stromatolite

Blue Planet

1500 BCE

O2 is in the water. (Oxidized out the iron)
Continents are moving.

Rodinia is formed

1000 BCE

Formed over the south pole and is blocking the currents.

Snowball Earth

700 BCE

Mass Extinction killed tiny organisms. (95%)

Rodinia breaking apart

650 BCE

Volcanic eruptions are breaking Rodinia apart.

Cambrian

550 BCE

"Boom of life."
Ice melts on Rodinia and is broke apart.
Ozone begins to form and marine life begins.

Ordovician

488 BCE

Sponges, corals, and primitive fish lived in the waters.
Red and green algae was in the water.

Silurian

443 BCE

Landmasses were low and sea levels were rising.
Shortest period in Paleozoic Era.

Mississippian

358 BCE

Shallow-water limestone deposits.
Vast forests and swamps form as sea levels fluctuate.
Climate: hot and humid. Abundant wildfires.
Oxygen levels: 40% above today.

Pennsylvanian

320 BCE

Widespread swamps formed coal.

Animals on land

300 BCE

Amphibians/reptiles, huge insects on land.
Pangaea forming and tropical swamps.

Permian

299 BCE

Ended in the largest mass extinction that Earth ever had.
Severe extremes of climate and environment. South was cold and arid.

Triassic

251 BCE

First period of the Mesozoic Era.
Life outside the oceans began to diversify.

Pangaea

250 BCE

Volcanic eruptions happened and killed 95% of extinctions.
O2 levels increased and dinosaurs are evolved.

Jurassic

201 BCE

Jurassic period started.
Middle period of Mesozoic Era.

Pangaea breaks up

180 BCE

Volcanic activity breaks up Pangaea.
High O2 levels/warm temperatures.

Cretaceous

145 BCE

The last of the three periods of the Mesozoic Era.
New groups of mammals and birds.

Diamonds

100 BCE

Pangaea is apart and diamonds erupt in the surface.

Tertiary

66 BCE

First period of the Cenozoic Era.
Ice Age.

Dinosaurs extinct

65 BCE

Enormous asteroid hits on Earth.
75% of species including dinosaurs go extinct.

Mammals dominate

50 BCE

Swiss Alps/Himalayas from colliding continents.

Himalayas

15 BCE

Himalayas and many other mountains began to form.

Grand Canyon

6 BCE

Grand Canyon was being formed.

Quaternary

2 BCE

Is in the Cenozoic Era.
Dramatic climate changes, that affect resources.

Present

10,000

Human civilization begins.
Today's era/period.