Jewelry makers have been showcasing the marine mollusk, and vintage sellers say they can’t keep them in stock.

but its colour is due to the mineral iron pyrite – often referred to as fool’s gold. Cross-section through a glittering, pyritised ammonite. Find out how different types of fossils form. In Hindu ...

Opalized ammonite fossils are some of the most unique and spectacular paleontological specimens. They were formed through a ...

The ammonoid (the round, snail-ish fossil) has been replaced by pyrite. Pyrite formation requires an absence of oxygen (or the iron would oxidize ... Even tiny organisms can leave coprolites. Look at ...

Ammonites make great index fossils due to their rapid evolution and wide distribution ... For example, when crystals of iron pyrite, which is also known as fool’s gold, form in fossils it can have a ...

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 ...

“We’d noticed these fossils before, but this time, Kolby brought a very large iridescent piece to me. It was clear he had discovered something extraordinary with this ammonite fossil.

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.