Opalized ammonite fossils are some of the most unique and spectacular paleontological specimens. They were formed through a geological process known as opalization, wherein organic material from ...

Earth once hosted more than 10,000 species of these ancient marine predators. Find out how they lived, when they vanished, and how much we know about them today. Based on the fossil record ...

Ammonites are a group of extinct shelled cephalopods related to today's squids and octopuses. Most ammonites died out 66 million years ago, at the same time as dinosaurs. Fossilised ammonite shells ...

Ammonites were shelled cephalopods that died out about 66 million years ago. Fossils of them are found all around the world, sometimes in very large concentrations. The often tightly wound shells of ...

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.

When we think of fossils it is usually of dinosaurs, or perhaps the beautiful spiral shape of an ammonite picked up on a beach during a summer holiday. We see fossils as ancient relics of the deep ...

Sam Rosenthal has been hunting fossils for more than 25 years in Montana, Wyoming, Maryland and Florida. Now, his collection of fossilized dinosaur bones, teeth and shells line the fourth floor of ...

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 ...

Ammonite fossils, an example is shown here, are sea creatures that became extinct about 65 million years ago. Fossil remains have been found in rocks of all ages. Fossils of the simplest organisms ...