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History of Life on Earth

A timeline of Earth to now with all major and some minor life forms throughout time.

Devon McCabe

on 21 December 2012

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Transcript of History of Life on Earth

Geologic Time Scale
of Earth The Precambrian Eon Archaean Era 700 Million years ago 1 Billion years ago 4.6 Billion years ago Paleozoic Era Mesozoic Era Jurassic Cretaceous Triassic Cenozoic Era 570 million years ago 492 million years ago 412 million years ago Carboniferous 345 million years ago 286 million years ago 144 million years ago 213 million years ago 248 million years ago Hadean Era Proterozoic Era •Life: Life could not exist at this point since the Earth was just made.
•Extinction: There was no life on Earth to wipe out.
•Tectonics: Mainly water and a large amount of volcanic eruptions.
•Climate: Atmosphere mainly leaked Hydrogen and Oxygen. •Life: Stromatolies were found during this period.
•Extinction: Unknown.
• Tectonics: Most of the continents are formed during this period.
•Climate: Lacked free oxygen and greenhouse gasses such as carbon dioxide were the main components. •Life: Eukaryotes such as acritarchs are found here and are the first multi cell organisms on the planet.
•Extinction: Unknown.
•Tectonics: Super continent Rodinia was formed.
•Climate: Oxygen was starting to build up. Cambrian Ordovician 435 million years ago Silurian Devonian Permian •Life: Marine based life forms such as sponges, corals, and Nautiloids.
•Extinction: Cambrian-Ordovician extinction event-
•Tectonics: Continents are still forming by the active volcanoes.
•Climate: Starts off cold, but then gradually warms up making the oceans perfect for the new forming life forms. •Life: Water based life forms are still strong during this time like the crinoids and the ancient form of the starfish.
•Extinction: Ordovician Extinction- Caused by the glaciers on the super continent Gondwanaland.
•Tectonics: One main continent during this time and its name is Gondwanaland.
•Climate: Warm, but once Gondwanaland moved to the southern pole glaciers started to form lowering the temperature and the water levels of the planet. •Life: Eurypterids flourished during this time such as the ptergotus.
•Extinction: Unknown.
•Tectonics: Gondwanaland was still at the southern pole.
•Climate: After the glaciers receded to planet started to warm up once again. •Life: Evolution trend from the Silurian period continue well into this period.
•Extinction: Major environmental changes occur here because of all the trees and plant life producing so much oxygen. Thus the planet cools because carbon dioxide is dropping since the plants are using that to perform photosynthesis.
•Tectonics: Two super continents are formed. Euramaerica and Gondwana
•Climate: The planet starts to cool because of all the plant life taking all the carbon dioxide and using it to feed them self. Also, the atmosphere is now mainly oxygen. •Life: all the land masses were covered in nothing but plants and the giant insects. Also, the only vertebrates are the amphibians and the fish.
•Extinction: Climate shifts because of all the oxygen in the air and also, glaciers start to form.
•Tectonics: The two super continents collide and form Pangea.
•Climate: Started off warm, but then started to gradually cool. •Life: Ancient forms of the reptiles become the dominated species on the land.
•Extinction: Increased volcanism and impact events.
•Tectonics: The super continent Pangea.
•Climate: 35- 21% of the oxygen was in the atmosphere. Quaternary Tertiary Scale 1 in. =5.98 million years (when viewed from the home button). • Life: Reptiles are flourishing during this time. For example, Megazosrodon, cycads, and nothosaurus.
• Extinction: Unknown.
• Tectonics: Pangea is the only land mass during this time, but may have many small islands around it.
• Climate: Very dry and water levels are low. • Life: Dinosaurs thrive and begin to attain massive sizes. First of the Archaeopteryx.
• Extinction: Unknown.
• Tectonics: Movement within the Earth’s crest begins to move faster now.
• Climate: sea levels begin to rise and temperature begins to increase as well. • Life: Plant life, dinosaurs become very diverse, and the first primitive mammals are seen (very small though).
• Extinction: K-T boundary- A layer in the Earth’s surface that shows a large impact happened and killed off all the dinosaurs.
• Tectonics: Pangea starts to brake up and move to current locations.
• Climate: Temperature varied greatly because of the impact. •Life: Plant life is starting to grow back, but only in places warm enough because of the glaciers. Hominids start to appear.
•Extinction: The Ice Ages- they are caused by the unstable atmosphere because of the large impact that happened during the Cretaceous Period.
•Tectonics: Pangea has fully broken up and is now in locations very close to present day.
•Climate: Starts off warm then gets cold fast. •Life: Wooly Mammoths, Giant deer, Nethanderthals, and Homo sapiens.
•Extinction: Ice ages are still in effect during the beginning part.
•Tectonics: The continents are in the same location as present-day.
•Climate: Starts off very cold the warms up to what we have now.
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