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What is a fossil?

How are fossils formed?

Where are fossils found?

Determining the age of fossils

Geological time scale

Eras and periods

Further information

Geological Eras and Periods

Ordovician Period

About 490 to 434 million years ago

Brachiopod assemblage.

Assemblage of brachiopod Archaeorthis from the Lower Ordovician of Waratah Bay, South Gippsland.

Source: Museum Victoria.

Graptolites.

Graptolite Tetragraptus fruticosus from the Early Ordovician, from Campbelltown, Victoria.

Source: Museum Victoria.

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