Ammonite fossil from Madagascar.
Section with polished face.
Decorative mounting on wooden base and methacrylate (included).
Measures: 13 x 10 cm
The ammonites are a subclass of cephalopod molluscs, which existed in the seas from the Devonian period (400 million years ago) until the end of the Cretaceous period (65.5 million years ago), when they became extinct.
Ammonites are excellent fossil guides for dating rocks.