Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective geology Of a
geologic era within theArchaean eon from about 4600 to 3600 million years ago; the firstsingle -celled life began at this time. - noun geology The Eoarchean era.
Etymologies
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Examples
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Though commonly used, the Hadean is not a formal eon and no lower bound for the Eoarchean has been agreed upon.
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