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 ...

They were formed through a geological process known as opalization, wherein organic material from ancient ammonite shells is replaced by silica, resulting in visually stunning fossils ...

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 ...

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 ...

The half-cut shell of the modern Nautilus (right). 3D-printed half-cut ammonite shell (left). Chamber model from the current study, cut to show internal geometry (top). Disclaimer: AAAS and ...

“An ammonite is a very vulnerable, soft sea slug, and to protect itself, it encases itself in a very hard shell [like Winslet’s character does].” Winslet has talked about the sex scenes in ...

“Those ammonites might have stored gases inside their shells and stood on the sea floor with the buoyancy force,” Muramiya said. The ammonite belonged to the same group as octopi, squid and ...