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 ...

An ammonite fossil with a carved snake's head Zoë Hughes ... They would move their entire body into a new chamber and seal off their old and now too-small living quarters with walls known as septa.

Some Hamites began life with a very small spiral shell, but typically grew into either ... Hildoceras bifrons with a carved snake's head Before science had an answer, ammonite fossils were a bit of a ...

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.

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 ...

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 ...