Crossword puzzle clue "a billion years to geologists"

Here are the possible solutions for a billion years to geologists clue

Answer
Clue
Relevancy
eon
Clue
A billion years, to geologists
Years and years and years
Definition
a long period of time, also AEON
ages
Clue
Years and years and years
Definition
AGE, to grow old
eons
Clue
Years and years and years
Geologists' times
Definition
EON, a long period of time, also AEON
eras
Clue
Geologists' periods
Geologists' studies
Geologists' divisions
Definition
ERA, a main division of geological time

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