Ammonite

This ammonite shell has been slightly worn and broken along a chamber wall, revealing its suture pattern. Suture patterns mark the areas where septae (walls dividing internal shell chambers) were fixed to the outer shell. Ornate suture patterns like this made shells stronger, but not much heavier. This allowed shells to be thin, while growing relatively quickly for protection.

 

 

Find out more about ammonites on the molluscs pages.

Common name

Ammonite

Scientific name

Pictonia

Type

Molluscs > Cephalopods


Strata

Kimmeridge Clay Formation

Time period

Upper Jurassic

Age

150 million years

Where found

Ringstead Bay

Found by

Adrian Brokenshire

Museum

Dorset County Museum, Dorchester

Accession number

DCM.G.12275-6