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Periods
Uh, I believe (in order from least to greatest time) that there are Epochs, Periods, Eras, and Ages.
Peropdozation
Millennium? Period of time equalling 1000 years
BC and AD.
A.D. and B.C.
geologic time scale
A millennium is a period of time that lasts one thousand years.
Chronological Thinking
Chronological Thinking
Geologic history is divided, from largest amount of time to smallest amount of time, by eons, eras, periods, and epochs.
fossil record geologic time scale