Ammonite

The two ammonites in this block both show bite marks towards the rear of the body chamber (the darker part of the ammonite). The chambers toward the centre of the ammonite were filled in with calcite crystal, while the body chamber was filled with sediment. The bite marks are always at the end of the long body chamber where large muscles would have been located to hold the body into the shell. We don’t know what animal actually made these bite marks – but it was probably soft-bodied squid.

This specimen is a paratype of Bicrescomanducator rolli. A paratype is an additional specimen that helps to define the variation in the fossil species.

 

Find out more about ammonites on the molluscs pages.

Common name

Ammonite

Scientific name

Promicroceras

Type

Molluscs > Cephalopods


Strata

Black Ven Marls

Time period

Lower Jurassic

Age

190 million years

Where found

Black Ven, Lyme Regis

Found by

Paddy Howe

Museum

Lyme Regis Museum

Accession number

L.2009.53