If I’m not wrong it’s Epochs and periods
eras
Eras are divided into periods.
groups ()
The Paleozoic, the Mesozoic and the Cenozoic are all divided into 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.
groups ()
i think so - yes
The Precambrian Era can be divided into three major eras. These eras include the Hadean, the Archean, and the Proterozoic.
eras
because
Time. The game.
Denis McQuail
The geological time scale is the history of the earth. This is in the eras period and epochs.