Eons, Eras, Periods and Epochs

How many Eras are there in total?
3
6
9
12
Which of these isn't a period?
Triassic
Ordovician
Quaternary
Mesozoic
What is the tertiary?
Eon
Era
Period
Epoch
Technically none of these
What was the very first eon we know of?
Archean
Phanerozoic
Proterozoic
Hadean
How many epochs is the Permian period split into?
2
3
4
5
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