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Denis McQuail
The geological time scale is the history of the earth. This is in the eras period and epochs.
Earth history is primarily divided into eras.
Earth's history is divided into eras.
Geologic history is divided, from largest amount of time to smallest amount of time, by eons, eras, periods, and epochs.
Geologic history is divided, from largest amount of time to smallest amount of time, by eons, eras, periods, and epochs.
eras
Geological eras can be divided into periods, epochs and ages.
Geological eras can be divided into periods, epochs and ages.
Eras are divided into periods.
i think the answer is in your BOOK check it out sometime.