Crossword puzzle clue "chapters in geology"

Here are the possible solutions for chapters in geology clue

Answer
Clue
Relevancy
eras
Clue
Chapters in geology
Definition
ERA, a main division of geological time
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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