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Ended 543 mya.
The earliest part of earth history. The Earth's crust was forming the land surface from molten rock cooling down.
Major event
- Ice age (snowball Earth). Oceans froze and the entire Earth was covered in ice that reflects most sunlight, keeping the Earth cold. Co2 emissions from volcanos warmed the Earth and melted the ice. -
Ended 2500 mya
The era when life first formed on Earth. Defined by the isotopic age, the surface cooled enough for rocks and continental, plates to form. No oxygen gas, though in compounds, an example is water.
Major events
- Rock formed. -
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Ended 290 mya
Major events
- Coal started forming under continents. -
Ended 543 mya.
Oxygen came during this era. Rocks contained fossils from primitive life forms from the Precambrian eon.
Major events
-Oxygen formed
-First oxygen depended on animals (Ediacaran Fauna).
-All continents were joined together (Pangea). -
Current period
Major events
- Mammals evolved
-Humans evolved -
Current Eon.
Living organisms formed. Mass extinction events occurred.
Major events
- 96% life on Earth has wiped away 51 mya.
- Extinction of dinosaurs 65 mya. Gave rise to new mammals. -
Ended 248 mya
Broken up into 6 periods
- Cambrian
- Ordovician
- Silurian
- Devonian
- carboniferous
- Permian
Major events
- Break up of one supercontinent and the formation of another.
- Plants became widespread.
- First vertebrae animals colonised the land. -
Ended 490 mya
Lasted 56. 5 million years
Major events
- Marked a burst in the evolution of an organism, known as Cambrian explosion, the sudden appearance of fossil with skeletal remains. -
Ended 443 mya
Major events
-Began with a mass extinction, called the Cambrian Ordovician extinction event, that eliminated brachiopods and conodonts. -
Ended 417 mya
Major events
- During this period continental land masses were low and sea levels were rising. -
Ended 354 mya
Major events
- Forest and coiled shell bearing organism first appeared during this period.
- The extinctions are caused by astronomic impacts and global oxygen shortages.
- Plate tectonics, sea level changes and climate change also caused the extinctions. -
Ended 248 mya
Last period in the palaeozoic era
Major events
- Ended in the largest mass extinction the Earth has ever experienced.
- The emergence of the supercontinent Pangaea caused server extremes of climate and environment due to its vast size. -
Ended 65 mya
Known as the age of reptiles and age of Conifers.
broken up into three periods
- Triassic
- Jurassic
- Cretaceous
Major events
- Many modern plants formed
- Invertebrates and fishes evolved
-land dinosaurs were the most dominant animals. -
Ended 206 mya
The first period of the Mesozoic era
major events
- Occurred after the great extinction.
- Land animals started to evolve.
- Volcanic eruptions, climate change and a fatal comet or asteroid triggered the extinction of more than 90% of species. -
Ended 144 mya
Also known as the age of reptiles.
Major events
-Super continent slipt apart.
- And a minor mass extinctions cause the Jurassic period to end.
-Most of the enormous sauropod dinosaurs and the stegosaurid died out. -
Ended 65 mya
Last and longest period of the Mesozoic era
Major events
-Tyrannosaurus Rex arose during this period.
- An extinction occurs either asteroid or natural disruptions. -
Current era
Major events
- extinction of dinosaurs
- rise of humans
- Last ice age ended 12,000 years ago.
Broken up into two periods
-Tertiary
- Quaternary -
Ended 1.8 mya
First period if the Cenozoic era
Major events
- Began with the demines of the non-avian dinosaurs.
- Series of ice ages occurred
- The climate on earth became dyer.
