Crossword puzzle clue "geology sample"

Here are the possible solutions for geology sample clue

Answer
Clue
Relevancy
rock
Clue
Geology sample
aeon
Clue
Unit in a geology book
Time span in a geology book
Division of geology
Definition
the largest division of geological time, composed of several eras, also EON
earthscience
Clue
Geology, e.g.
Geology, for one
earthsciences
Clue
Geology and meteorology
eon
Clue
One billion years, in geology
Definition
a long period of time, also AEON

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