Alexis Geologic Timeline

4500 BCE

Beginning of Earth

Temperature: 8000F
Comets forming the Earth.
Earth was molten.
4400 BCE

Water was beginning to form on Earth

Starting to cool and solidify.
4000 BCE

Earth is covered in water vapor

Water world: 90% (green oceans and iron)
Atmosphere: CO2 (thick and red)
3400 BCE

Continents began to form

Oceans become dominated.
Granite appears. (salt water + basalt)
2500 BCE

Granite Planet

Continents formed everywhere.
Species dominated: Stromatolite
1500 BCE

Blue Planet

O2 is in the water. (Oxidized out the iron)
Continents are moving.
1000 BCE

Rodinia is formed

Formed over the south pole and is blocking the currents.
700 BCE

Snowball Earth

Mass Extinction killed tiny organisms. (95%)
650 BCE

Rodinia breaking apart

Volcanic eruptions are breaking Rodinia apart.
550 BCE

Cambrian

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

Ordovician

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

Silurian

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

Mississippian

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

Pennsylvanian

Widespread swamps formed coal.
300 BCE

Animals on land

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

Permian

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

Triassic

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

Pangaea

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

Jurassic

Jurassic period started.
Middle period of Mesozoic Era.
180 BCE

Pangaea breaks up

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

Cretaceous

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

Diamonds

Pangaea is apart and diamonds erupt in the surface.
66 BCE

Tertiary

First period of the Cenozoic Era.
Ice Age.
65 BCE

Dinosaurs extinct

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

Mammals dominate

Swiss Alps/Himalayas from colliding continents.
15 BCE

Himalayas

Himalayas and many other mountains began to form.
6 BCE

Grand Canyon

Grand Canyon was being formed.
2 BCE

Quaternary

Is in the Cenozoic Era.
Dramatic climate changes, that affect resources.
10,000

Present

Human civilization begins.
Today's era/period.