Crossword puzzle clue "periods for geologists"

Here are the possible solutions for periods for geologists clue

Answer
Clue
Relevancy
eras
Clue
Geologists' periods
Periods for geologists
Geologists' studies
Geologists' divisions
Geologists record five.
Geologists record five of these
Definition
ERA, a main division of geological time
eon
Clue
A billion years, to geologists
Definition
a long period of time, also AEON
eons
Clue
Geologists' times
Definition
EON, a long period of time, also AEON

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