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im not sure about this but i think this is it.

Eonothem - Eon =4 total, half a billion years or more

Erathem- Era = 10 total, several hundred million years

System - Period

Series - Epoch =tens of millions of years

Stage- age =millions of years

Chronozone - Chron = subdivision of an age, not used by the ICS timescale

Q: What are the different units of the geological time scale?

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im not sure about this but i think this is it.

Eonothem - Eon =4 total, half a billion years or more

Erathem- Era = 10 total, several hundred million years

System - Period

Series - Epoch =tens of millions of years

Stage- age =millions of years

Chronozone - Chron = subdivision of an age, not used by the ICS timescale

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In geological time the Eon is larger than the Period. The Eon is the largest division of geological time recognised by the International Commission of Stratigraphic.

The ICS have divided the time as such from largest to smallest.

Super-Eon - (SuperEonothem) (Not recognised by the ICS but unofficially recognised e.g. Precambrian time)
Eon - (Eonothem)
Era - (Erathem)
Period - (System)
Subperiod - (SubSystem)
Epoch - (Series)
Age - (Stage)
Chron - (Chronozone) (Not recognised by the ICS but is unofficially recognised usually based on reversal of earths magnetic field)

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In geological time a period is smaller than an era but larger than a Epoch.

The International Commission of Stratigraphic have divided the time as such from largest to smallest.

Super-Eon - (SuperEonothem) (Not recognised by the ICS but unofficially recognised e.g. Precambrian time)
Eon - (Eonothem)
Era - (Erathem)
Period - (System)
Subperiod - (SubSystem)
Epoch - (Series)
Age - (Stage)
Chron - (Chronozone) (Not recognised by the ICS but is unofficially recognised usually based on reversal of earths magnetic field)

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The Precambrian is the informal time before the Cambrian Period.

It is informally called a Super-Eon and certainly not a geological Era.

Geological time intervals from largest to smallest :-

Super-Eon - AEonothem (informal)
Eon - Eonothem
Era - Erathem
Period - System
Epoch - Series
Age - Stage
Chron - Chronozone (informal)

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Both epochs and eras are divisions of geological time

The largest of the time divisions are Super-Eons.

Super-Eons are sub divided into Eons.

Eons are sub divided into Eras.

Eras are sub divided into Periods

Periods are sub divided into Epochs

Epochs are sub divided into Ages.

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