Crossword puzzle clue "extremely long periods of time"

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Here are the possible solutions for extremely long periods of time clue

Answer
Clue
Relevancy
eon
Clue
Long long long long long long long time
Periods upon periods
Long, long, long time
Long, long, long time period
Definition
a long period of time, also AEON
eons
Clue
Extremely long time periods
Extremely long periods in geological history
Long, long periods
Definition
EON, a long period of time, also AEON
eras
Clue
Extremely long periods of time
Definition
ERA, a main division of geological time

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