Scientists during the time of the Great Inventing created a scale named the Geologic Time Scale to determine the history of Earth. Based on findings, they created a scale that was separated into different divisions called eons, eras, periods & epochs. They also adopted the term "supereon" to account the timeline that contained the majority of eons in the Earth's history.


Supereon Eon Era Period Epoch Span Main events
Phanerozoic Cenozoic Quaternary Holocene 12 tya - Today Human civilization
Pleistocene 1 mya - 12 tya Ice age
Tertiary Pliocene 65 - 1 mya Human evolution
Mesozoic Cretaceous 144 - 65 mya Cretaceous Mass Extinction
Jurassic 200 - 144 mya Dinosaurs enter Age of the Giants
Triassic 250 - 200 mya Dinosaurs first appear
Paleozoic Permian 300 - 250 mya Permian Mass Extinction
Pennsylvanian 360 - 300 mya Life on land continues to bloom
Devonian 380 - 360 mya Life on land
Silurian 417 - 360 mya Life in ocean continues to evolve
Ordovician 485 - 417 mya Gondwana forms
Cambrian 542 - 485 mya Cambrian Explosion
Precambrian Proterozoic Neoproterozoic Vendian 2.5 bya - 542 mya Snowball Earth
Tonian ?
Mesoproterozoic Stenian ?
Ectasian ?
Calymmian ?
Paleoproterozoic Statherian ?
Orosirian ?
Rhyacian ?
Siderian ?
Archean Neoarchean 3.8 - 2.5 bya ?
Mesoarchean ?
Paleoarchean Stromatolites appear
Eoarchean First life
Hadean 4.6 - 3.8 bya Origin of the Earth
Chaotian 14 - 4.6 bya Big Bang & Formation of the Solar System

History of EarthEdit

Main article: History of Earth

Chaotian EonEdit

Main article: Chaotian

The eon prior to the start of the Hadean & the Precambrian Supereon is the Chaotian. The Chaotian was recognized as the time before the formation of Earth & spans from the time of the Big Bang at the beginning of the universe 14 billion years before the present up to about 5 to 4.6 billion years ago when the Earth formed.

Precambrian SupereonEdit

Main article: Precambrian

The Precambrian Supereon is all time before the Cambrian Explosion in the Cambrian Period of the Paleozoic Era of the Phanerozoic Eon. It depicts 90% of the entire history of Earth.

Hadean EonEdit

Main article: Hadean

As a newborn planet, Earth was a giant molten ball of fire with an atmosphere that had little or no oxygen. After about 100 million years after it's creation, the Moon was captured & put into an orbit over the Earth. The Earth then cooled to form a crust over the next 600 million years. 3.9 billion years ago, the Earth entered the Late Heavy Bombardment, when meteors attacked the Earth & supplyed water for the world's oceans. During the Bombardment that lasted 100 million years, the Moon distanced from Earth, slowing the planet's rotation & lowering tides.

Archean EonEdit

Main article: Archean

3.8 billion years ago, in the oceans, bacteria appeared as the first life. Over time, they began evolving into newer prokaryotic (unicellular) organisms, becoming cyanobacteria, which cemented with minerals from the rocks on the seabeds in shallow waters to become a structure called stromatolites. Cyanobacteria, using photosynthesis, created oxygen over the next 2 billion years.

Proterozoic EonEdit

Main article: Proterozoic

Stromatolites from the Archean continued to create oxygen for the atmosphere. At the end of the Mesoproterozoic Era, the Earth generated heat that made the mantle break the crust into plates that made islands collide & merge. 1 billion years ago, the plates formed the first supercontinent in Earth's history, Rodinia. Rodinia existed for about 350 million years before it broke apart. 558 million years ago, global cooling, caused by volcanic activity spawned from the breakup of Rodinia, starts Snowball Earth, a fifteen million year long ice age that was the longest & coldest in Earth's history. 543 million years ago, the Earth's volcanoes break the surface of the ice & warm the atmosphere.

Phanerozoic EonEdit

Main article: Phanerozoic

Paleozoic EraEdit

Main article: Paleozoic
Main article: Cambrian

The Cambrian began with the intense spawning of eukaryotic (multicellular) life. Prior to the recently concluded Snowball Earth, the only life on Earth was prokaryotic cells of bacteria that lived in the oceans. In the oceans, newer life forms appeared, such as wiwaxia, pikaia, anomalocaris & elrathia, the first species of the trilobites. All life is under the ocean.

Main article: Ordovician

The Ordovician continued with life in the oceans. Life continued to evolve under the waves while the tectonic plates shifted again. This time, they formed the second supercontinent, Gondwana. This supercontinent mostly contained areas such as present day Wildwood, the Big Apple & Storm Island while missing other chunks of land such as the Ovalia & Siberia.

Main article: Silurian

In the Silurian, the ozone layer began to develop to block out ultraviolet radiation while life continued evolution under the waves.

Main article: Devonian

Most of the Devonian Period, life was in the water. However, the ozone layer closes up & shields the Earth from radiation. With no UV light getting to the surface of the Earth, life moves onto land, spawning newer life forms.

Main article: Pennsylvanian

The movement & evolution of life on land in Gondwana continues. In this time, Ovalia & Siberia collide with Gondwana & merge. The oxygen in the atmosphere was greater than it is in the Holocene, making most animals giants. However, some creatures, such as mammals, end up being small, such as the ottsels, which appear in the Middle Pennsylvanian.

Main article: Permian

Mesozoic EraEdit

Main article: Mesozoic
Main article: Triassic
Main article: Jurassic
Main article: Cretaceous

Cenozoic EraEdit

Main article: Cenozoic
Main article: Tertiary
Main article: Quaternary
Main article: Pleistocene
Main article: Holocene