Crossword puzzle clue "billions of years geologically"

Here are the possible solutions for billions of years geologically clue

Answer
Clue
Relevancy
eons
Clue
Billions of years, geologically
Billions and billions of years
Definition
EON, a long period of time, also AEON
many
Clue
Billions and billions
Definition
a great number
sagan
Clue
Carl who said "billions and billions . . ."
"Billions and Billions" author Carl
"Billions and billions" astronomer
"Billions & Billions" author Carl
"Billions & Billions" author

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