Precambrian Supereon
Precambrian Supereon
Billions of years of Earth’s past pre-dated animals, but established the conditions for animal life.
Learning Objective: Provide the approximate time span, geologic changes, and representative organisms of the Precambrian Supereon.
Animals need oxygen for cellular respiration and other organisms to eat. The Precambrian Supereon set up the conditions for animal life.
This video introduces the major features of the Precambrian Supereon.
Watch this video; you can select the closed captioning “cc” option if you would like to see the text.
Remnants of prehistoric cyanobacteria activity are found in stromatolites and date backas far as 3.6 billion years ago.
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These stromatolites are from western Australia. Cyanobacteria secrete layers of chemicals, including calcium. Fossilized stromatolites date as far back as 3.4 to 3.6 bya. Descendent cyanobacteria still form stromatolites in Australia to this day.
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By the end of the Precambrian Supereon, all life still existed in the oceans.
The next section continues the story of life, including the origins of vertebrates, with the Phanerozoic Eon.
Check your knowledge – Precambrian
Review your notes. Can you describe the environmental conditions and forms of life in the Precambrian Supereon? If so, move forward to the next page.
Learning Objective:
Provide the approximate time span, geologic changes, and representative organisms of the Precambrian Supereon.
Go back to the Geologic Time Page
Go forward to the Phanerozoic Page
Geologic Time Contents
Complete all five of these sections before taking the quiz and submitting your media piece.
This Module
7: How long has it been here?
This Guide
7A: Geologic Time
Products Information
7A: Quiz & Media
