Crossword puzzle clue "geologists record five of these"

Here are the possible solutions for geologists record five of these clue

Answer
Clue
Relevancy
eras
Clue
Geologists record five of these
Geologists record five.
Geologists' periods
Geologists' studies
Geologists' divisions
Periods for geologists
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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