Crossword puzzle clue "long period of history"

Here are the possible solutions for long period of history clue

Answer
Clue
Relevancy
eon
Clue
Long long long long long long long time
Long, long, long time period
Long, long period
Definition
a long period of time, also AEON
budgrant
Clue
NFL coach whose long stint with the Vikings was the most successful period of their history: 2 wds.
era
Clue
Long period of history
Mesozoic ___ (long period of history)
Definition
a main division of geological time
aeon
Clue
Long, long period
Long, long time period (var.)
Definition
the largest division of geological time, composed of several eras, also EON

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