The fossil record is chock-full of the fossilized remains of spiral-shelled ammonoids, whose shapes are reminiscent of rams' horns.But there was another type of ammonoid with long, straight ...

Ammonites – the ancient relatives of squid and octopuses – left behind some of the most common and beautiful fossils. But look closely at their elegant, spiral shells and you might be able to ...

Physics determined ammonite shell shape Date: October 10, 2014 Source: CNRS (Délégation Paris Michel-Ange) Summary: Ammonites are a group of extinct cephalopod mollusks with ribbed spiral shells.

Some larger and more visually striking fossils have already been transferred to the Smithsonian Institution, including a particularly large ammonite with an 18-inch spiral shell.

A fossil of an ammonite without its shell Klug et al. (2021) Ammonites are among the most common marine fossils from the age of the dinosaurs, but no one has found one like this before.

The fossil was discovered in the limestone of the Solnhofen-Eichstätt region of southern Germany. Around 150 million years ago, this area was a lagoon surrounded by an archipelago of islands.

When nummulites are bisected horizontally they appears as a perfect spiral. Since they were common in ancient Egypt, it's believed the shells were used as coins, perhaps explaining their name.

While ammonite shells are abundant in the fossil record, it was only recently that scientists have found a very rare fossil of the soft parts of an ammonite. However, fossilised evidence of ammonite ...

Fossils in the Boquillas Formation at Big Bend National Park in Texas reveal new clues about the Cretaceous. ... including a particularly large ammonite with an 18-inch spiral shell. ...

The well-known fossil shell Fusus contrarius from the ... A CORRESPONDENT has raised the question as to whether there is any explanation for the fact that spiral shells of present-day marine ...

A relative of squid and octopi, the chambered nautilus grows to about 8 inches long, with a spiral shell and about 90 tentacles it uses to catch prey. It’s often called a “living fossil” because of ...