Crossword puzzle clue "extremely long periods in geological history"

Here are the possible solutions for extremely long periods in geological history clue

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

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