Clue: A billion years, in geology
A billion years, in geology is a crossword puzzle clue that we have spotted 3 times. There are related clues (shown below).
Referring crossword puzzle answers
Likely related crossword puzzle clues
Recent usage in crossword puzzles:
- LA Times - Feb. 22, 2021
- Universal Crossword - Nov. 6, 2011
- Universal Crossword - July 29, 2009