Hadean Time Definition

hā-dēən
noun
The Hadean period of time.
American Heritage
Synonyms:
  • Priscoan aeon
  • Priscoan eon
  • Priscoan
  • Hadean aeon
  • Hadean eon
  • hadean
pronoun

(geology) The geologic eon from about 4,600 to 3,800 million years ago; marked by the formation of the first rocks.

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