Crossword puzzle clue "geology period"

Here are the possible solutions for geology period clue

Answer
Clue
Relevancy
eon
Clue
Geology period
Definition
a long period of time, also AEON
era
Clue
Period in geology
Definition
a main division of geological time
neocene
Clue
Tertiary period in geology.
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

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