Crossword puzzle clue "lifeless geological period"

Here are the possible solutions for lifeless geological period clue

Answer
Clue
Relevancy
azoic
Clue
Lifeless geological period
Definition
lacking life, esp. of geological period
gratefuldead
Clue
Lifeless-sounding band with lifeless-sounding fans
aeon
Clue
Geological period
Geological time period
Long geological period
Long geological time period
Long geological period (var.)
Geological time period (Var.)
Definition
the largest division of geological time, composed of several eras, also EON

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