Crossword puzzle clue "unit in a geology book"

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Answer
Clue
Relevancy
aeon
Clue
Unit in a geology book
Time span in a geology book
Division of geology
Definition
the largest division of geological time, composed of several eras, also EON
earthscience
Clue
Geology, e.g.
Geology, for one
earthsciences
Clue
Geology and meteorology
eon
Clue
One billion years, in geology
Two or more eras, in geology
Definition
a long period of time, also AEON

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