Eras are great lengths of time but periods are the small amounts of time in eras.
Super-Eons, Eons, Eras, Periods, Epochs and Ages are all units of geological time.
Super-Eons are divided into Eons, Eons in Eras, Eras into Epochs and Epochs into Ages.
An example is
The Precambrian Super-Eon (4,500 - 542 Ma) is divided into the
Hadean Eon (4,500 - 3,800 Ma),
Archean Eon (3,800 - 2,500 Ma) &
Proterozoic Eon (2,500 - 542 Ma).
The Proterozoic Eon (2,500 - 542 Ma) is divided into the
Paleoproterozic Era (2,500 - 1,600 Ma),
Mesoproterozic Era (1,600 - 1,000 Ma) &
Neoproterozic Era (1,000 - 542 Ma).
The Neoproterozic Era (1,000 - 542 Ma) is divided into the
Tonian Period(1,000 - 850 Ma),
Cryogenian Period (850 - 630 Ma) &
Ediacaran Period (630 - 542 Ma).
And so on.
Eras and periods both appear at the start of the Cambrian period.
Geologic time scale
Geological eras can be divided into periods, epochs and ages.
Eons, Eras,Epochs, and period
Time. The game.
cenizoic hadean paleothenic heliothenic
Eras divide into periods and periods divide into epochs. The Palaeozoic Era is composed of the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian periods (in that order). The Mesozoic Era is divided into the Triassic, Jurassic and Cretaceous periods. The Cenozoic Era is divided into the Tertiary and Quaternary periods. The Tertiary period is divided into the Palaeocene, Eocene, Oligocene, Miocene and Pliocene epochs while the Quaternary period is divided into the Pleistocene and Holocene epochs. Note that eras are not the longest lengths of time. Eras may compose longer stretches of time known as eons/aeons.
eras and periods
Periods are subdivisions of geological eras.
Eras are divided into periods.
periods make up eras
Geological eras can be divided into periods, epochs and ages.
Geological eras can be divided into periods, epochs and ages.
periods
Periods mean eras centuries ages
Eons, Eras,Epochs, and period
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If I’m not wrong it’s Epochs and periods
Time. The game.