Crossword puzzle clue "unit of geological time"

Here are the possible solutions for unit of geological time clue

Answer
Clue
Relevancy
eon
Clue
Geological time unit
Very long geological time unit
Definition
a long period of time, also AEON
epoch
Clue
Geological time unit
A unit of geological time
Unit of geological time
Definition
an important period of time, also EPOCHA
aeon
Clue
Geological time
Geological time period
Longest division of geological time
Definition
the largest division of geological time, composed of several eras, also EON

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