Crossword puzzle clue "geological sample"

Here are the possible solutions for geological sample clue

Answer
Clue
Relevancy
core
Clue
Geological sample
Definition
to remove the central part of
aeon
Clue
Geological period
Geological time
Geological span
Geological time period
Longest division of geological time
Geological age
Long geological period
Definition
the largest division of geological time, composed of several eras, also EON

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