A Russian connection
This is an Upper Jurassic ammonite with distinctive ribs, making it one of the easiest to identify. Note how the ribs split into two towards the shell’s outer edges. As the name suggests, this is a Russian ammonite, or at least it can be found far to the north and east of us. This indicates that during the Kimmeridgian time, the sea was extensive over northern Europe and further east.
Find out more about ammonites on the molluscs pages.