Crossword puzzle clue "hadean or archean e g"

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Answer
Clue
Relevancy
eon
Clue
Hadean or Archean, e.g.
The Hadean was the first one, ending about 4 billion years ago
The Hadean was the earth's first one
Phanerozoic or Archean, e.g.
Definition
a long period of time, also AEON
eons
Clue
Archean and Proterozoic
Definition
EON, a long period of time, also AEON

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