Some ammonites had long ... sutures—the complexity of which varied tremendously throughout this animal’s evolution. The many chambers of their shells likely helped these cephalopods glide ...

We now know ammonites are extinct cephalopod molluscs related to squids and octopuses, which lived in the seas of the Mesozoic Era between about 201 and 66 million years ago. They are preserved as ...

Zoë says, 'Ammonites were quite diverse and evolved rapidly, so if you sample stratigraphically through rocks, you can actually see the evolution and the changes through them.' Ammonites came in a ...

Opalized ammonite fossils are formed through a unique geological process involving the replacement of organic material with silica, which is the primary component of opal. This process can occur ...

Ammonite fossils, an example is shown here ... This supports Darwin's theory of evolution, which states that simple life forms gradually evolved into more complex ones. Evidence for early forms ...

Ammonite fossils, an example is shown here ... This supports Darwin's theory of evolution, which states that simple life forms gradually evolved into more complex ones. Evidence for early forms ...

It challenges simplistic narratives in paleontology and provides a new perspective on the final chapter of ammonite evolution before their abrupt extinction.

Fossils found in the northern part of Hokkaido are a new type of ammonite, the once-ubiquitous spiral-shelled creatures that went extinct with the dinosaurs 65 million years ago, researchers said.