Crossword puzzle clue "levels of rock in a geological structure"

Here are the possible solutions for levels of rock in a geological structure clue

Answer
Clue
Relevancy
strata
Clue
Levels of rock in a geological structure
Geological levels
Rock levels
gibraltar
Clue
The Rock of ___ (after translation, "The Rock of the Rock of Tariq")
aeon
Clue
Geological period
Geological time
Geological span
Geological time period
Definition
the largest division of geological time, composed of several eras, also EON

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