Ammonite

Spines and ribs

This is probably the most distinctive of the often highly-eccentric ammonites from the Lower Chalk. The image is two views of the same ammonite, showing how the ribs extend right across the keel (the edge of the ammonite). There are several similar forms of ammonite in the Lower Chalk and they can be distinguished by the spines, tubercles and ribs that may split (bifurcate).

Find out more about ammonites on the molluscs pages.

Common name

Ammonite

Scientific name

Mantelliceras dixoni

Type

Molluscs > Cephalopods


Strata

Chalk, Lower

Time period

Upper Cretaceous

Age

96 million years

Where found

Lyme Regis

Found by

Unknown

Museum

Dorset County Museum, Dorchester

Accession number

DCM.G.09723