Here we have an internal and external view of a goniatite that was collected from the Postojna Caves in Slovenia. This dates from 360 million years ago which dates it to the early Carboniferous (Mississippian period). Goniatites were the precursors to ammonites and had a simpler suture dividing the chambers of the shell. If anyone could attempt to identify the species I would be very grateful. Thanks Jean, what a lovely present for you!