Ammonites are extinct marine mollusks that thrived in Earth’s oceans for over 300 million years before their extinction around 66 million years ago. They were spiral-shelled creatures ...

Ammonites' growing shells typically formed into a flat spiral, known as a planispiral, although a variety of shapes did evolve over time. Shells could be a loose spiral or tightly curled with whorls ...

Based on the fossil record, ammonites came in a wide range of sizes and shapes, from smaller than an inch to as large as nine feet wide. Some ammonites had long, straight shells, while others had ...

Ammonites started out in life with a tiny shell and built new living chambers onto it as they grew. Their growing shells commonly formed into a tightly wrapped spiral, but some ammonites had stranger ...

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.

Even if you go solo, you may find Ichthyosaur vertebrae, fossilized sea urchins, and spiral ammonite (seen above). You are not permitted to dig, but you can usually take what you find on the ...