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Questions and Answers
Which unit on the geologic time scale is the oldest recorded?
When did the Archean Eon begin and end?
Where were the oldest Zircon grains found?
What is the main source of our knowledge about the Earth's earliest history?
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How did the oxygen content in today's atmosphere slowly accumulate through time?
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During which eon did the Archean Eon occur?
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What is the approximate age of the oldest recorded unit on the geologic time scale?
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Where were the oldest Zircon grains found?
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What is the main source of our knowledge about the Earth's earliest history?
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During which eon did the Archean Eon end?
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Study Notes
Geologic Time Scale
- The Hadean Eon is the oldest recorded unit on the geologic time scale.
Archean Eon
- The Archean Eon began around 3.8 billion years ago and ended around 2.5 billion years ago.
- It occurred during the Precambrian Supereon.
Oldest Zircon Grains
- The oldest Zircon grains were found in Western Australia, specifically in the Jack Hills.
Earth's Earliest History
- The main source of our knowledge about the Earth's earliest history is Zircon grains.
- These grains provide evidence of the Earth's earliest crust and the evolution of the atmosphere.
Oxygen Accumulation
- The oxygen content in today's atmosphere slowly accumulated through time as a result of oxygen-producing cyanobacteria.
Age of the Oldest Recorded Unit
- The approximate age of the oldest recorded unit on the geologic time scale is around 4.5 billion years old.
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Description
Test your knowledge of the geologic time scale and the Archean Eon with this quiz. Learn about the oldest recorded unit on the time scale, zircon grains, and more.
