Crossword puzzle clue "proterozoic"

Here are the possible solutions for proterozoic clue

Answer
Clue
Relevancy
eon
Clue
Proterozoic, for one
Proterozoic or Archeozoic, e.g.
Proterozoic ___
Definition
a long period of time, also AEON
eons
Clue
Archean and Proterozoic
Definition
EON, a long period of time, also AEON
era
Clue
Archeozoic or Proterozoic
Definition
a main division of geological time

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