They had intricate, coiled shells ... s not surprising that opalized ammonite fossils, with their striking beauty and unique ...

An ammonite fossil with a carved snake's head Zoë Hughes, Curator of Fossil Invertebrates at the Museum, explains, 'Ammonites are extinct shelled cephalopods. All of them had a chambered shell that ...

Ammonite shells are used today as index fossils, meaning they can help date other fossils that are found in the same layer of marine rock. These cephalopods make for ideal index fossils because ...

Most ammonites died out 66 million years ago, at the same time as dinosaurs. Fossilised ammonite shells can be found all around the world, including on parts of Britain's coastline. But if you can't ...