Crossword puzzle clue "chapter in a geology textbook perhaps"

Here are the possible solutions for chapter in a geology textbook perhaps clue

Answer
Clue
Relevancy
epoch
Clue
Chapter in a geology textbook, perhaps
Definition
an important period of time, also EPOCHA
era
Clue
Chapter in a geology text, maybe
Definition
a main division of geological time
index
Clue
Textbook's last chapter, often
Textbook's last chapter
Definition
to provide with an index
lesson
Clue
Textbook chapter
Definition
a teaching
unit
Clue
Textbook chapter
aeon
Clue
Unit in a geology book
Time span in a geology book
Definition
the largest division of geological time, composed of several eras, also EON

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