Ammonite

This is an unusual preservation, with the centre of the ammonite missing. Ammonites have a spiral shell divided into chambers. They could control their buoyancy in the water by filling the chambers with gas and water. The soft body of the ammonite only took up the last half whorl of the shell. Only the shells of ammonites have ever been found as fossils.

Find out more about ammonites on the molluscs pages.

Common name

Ammonite

Scientific name

Glaucolithies goreia

Type

Molluscs > Cephalopods


Strata

Portland Beds

Time period

Upper Jurassic

Age

150 million years

Where found

Unknown

Found by

Unknown

Museum

Portland Museum

Accession number

POLPM.1993.267