Ammonite

Golden ammonite

This ammonite is preserved in iron pyrites, giving the golden, irridescent effect. Specimens like this can be found on beaches where the sea has done all the hard work by washing away the thick, sticky Oxford clay. Many of the Oxford clay ammonites develop a similar form to this, with fine, splitting or ‘bifurcating’ ribs often decorated with tubercles or spines. 

Find out more about ammonites on the molluscs pages.

Common name

Ammonite

Scientific name

Kosmoceras (Lobokosmokeras) proniae

Type

Molluscs > Cephalopods


Strata

Oxford Clay

Time period

Upper Jurassic

Age

160 million years

Where found

Weymouth

Found by

Unknown

Museum

Dorset County Museum, Dorchester

Accession number

DCM.G.02876