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Precambrian Timeline
6
Transcript
By: Emily Ottoy and Avery Herrgott
Precambrian Timeline
Earth During the Precambrian Era
Landmasses
When This Era Started
More Information
This time period began with the formation of Earth about 4.6 billion years ago.
Many changes occured, and from about 4.5 to 3.8 billion years ago, early Earth was formed.
Climate
Climate During the Precambrian Era
- During this time period, the continents were located near the South Pole, and "this maybe have initiated a cooling of the continents, probably during a time when the orbital configuration favoured the growth of ice sheets." -http://www.climate.be/textbook/chapter5_node8.html
- Around 600 to 700 million years ago, a glaciation took place, and the entire Earth "might have been totally covered by ice during some of this glacial period." -http://www.climate.be/textbook/chapter5_node8.html
Earth Events in the Precambrian time
Earth Events
- "From about 4.5 to 3.8 billion years ago, early Earth formed into a spherical planet, and its molten rocks cooled." (pg. 124)
- "Toward the end of Precambrian time, much of Earth's land surfaces were located near the poles and covered in ice. Land on Earth was largely frozen and lifeless."
- "Earth's early atmosohere was made mainly of gases released by volcanic eruptions. During the Archeon eon, water vapor was added to the atmosphere by almost constant volcanic activity." (pg. 24)
Organisms in the Precambrian Time
Organisms
- The earliest organisms were microscopic bacteria, which came to the Earth around 3.4 billion years ago. This bacteria began photosynthesis that would open the planet up to plant and animal life. (https://www.nationalgeographic.com/science/prehistoric-world/precambrian-time/)
- When the Archean period ended during the Precambrian era, the first multicellular animals lived on Earth. (https://animalsake.com/precambrian-animals)
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