Crossword puzzle clue "certain geological epoch"

Here are the possible solutions for certain geological epoch clue

Answer
Clue
Relevancy
eocene
Clue
Certain geological epoch
Geological epoch
Geological epoch in which mammals arose
Definition
of rock formed in the second epoch of the Tertiary geological period
aeon
Clue
Epoch upon epoch
Definition
the largest division of geological time, composed of several eras, also EON
eocenes
Clue
Deposits from a geological epoch
erian
Clue
Of a geological epoch
lias
Clue
Geological epoch
Definition
the lowest series of rocks of the Jurassic system
miocene
Clue
Geological epoch when mastodons appeared
Definition
denoting the fourth epoch of the Tertiary period

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