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- No document names a year, a ruler or an event.
Why are early dates approximate?
No documents
no year, ruler or event named
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Earth layers and science
how we date instead
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A range, not a year — so we say about
- Dates come from earth layers and scientific methods, which give a range, not an exact year.
- That is why we say "about 2 million years ago" instead of one exact year.
