Crossword puzzle clue "billion year span"

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Here are the possible solutions for billion year span clue

Answer
Clue
Relevancy
eon
Clue
Billion-year span
Billion-year time span
Span of a billion years
Billion-year stretch
Billion-year period
Billion-year time period
Definition
a long period of time, also AEON
aeon
Clue
Billion-year period
Definition
the largest division of geological time, composed of several eras, also EON
aldiss
Clue
''Billion Year Spree'' author Brian

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