Crossword puzzle clue "a billion years in geology"

Here are the possible solutions for a billion years in geology clue

Answer
Clue
Relevancy
eon
Clue
One billion years, in geology
A billion years, in geology
1,000,000,000 years, in geology
Years and years and years
Definition
a long period of time, also AEON
eons
Clue
Billion-year increments, in geology
Years and years and years
Definition
EON, a long period of time, also AEON
ages
Clue
Years and years and years
Definition
AGE, to grow old
aeon
Clue
A billion years
Definition
the largest division of geological time, composed of several eras, also EON

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