Crossword puzzle clue "one billion years in geology"

Here are the possible solutions for one 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
One billion years
Definition
the largest division of geological time, composed of several eras, also EON

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