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Archaean
The middle era of Precambrian time, spanning the period between 3.8 and 2.5 billion years ago. Life arose on Earth during the early Archaean, as indicated by the appearance of fossil bacteria in rocks thought to be about 3.5 billion years old. Its name means "ancient."
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- Part of Speech: noun
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- Industry/Domain: Earth science
- Category: Geology
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