The specimen that defines a species
This is a really significant specimen as it is a ‘holotype’, meaning it defines the species Reineckia duplex. If anyone wants to identify a similar find, they would need to come back to this specimen in order to make comparisons.
The fossil is also unusual in that the mouth border is complete and includes a strange extension of the shell known as a lappet.
Find out more about ammonites on the molluscs pages.