Coral

Additional images

Colonial corals

These corals are known as ‘starred agate’ because their cross-section forms a star shape. They are a colonial coral, that is, they live together to form a structure much larger than the individuals that make it up. These are also reef building corals that today, form coral reefs. They are quite unlike solitary corals (see lower photo) that grow on hard surfaces such as bare rock. The corals were made of calcium carbonate, but this was replaced by silica during fossilisation. 

Find out more on the corals page.

Common name

Coral

Scientific name

Isastraea oblonga

Type

Other


Strata

Portland Limestone

Time period

Upper Jurassic

Age

150 million years

Where found

Isle of Portland

Found by

Unknown

Museum

Dorset County Museum, Dorchester

Accession number

DCM.G.06234