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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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