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Why can scientists not always divide a period into epochs

Why can scientists not always divide a period into epochs
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Why can scientists not always divide a period into epochs

User Adarsh Pawar
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Too little is known about pre-Archean time, from the origin of Earth to 3.8 billion years ago, to divide that period into units.
User Mez
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Too little is known about pre-Archean time, from the origin of Earth to 3.8 billion years ago, to divide that period into units.
User Gedalya
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