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 ...

They're a really good indicator for biostratigraphy.' Another potential use for ammonite fossils could be for telling us about how animals responded to climate change in the past. Zoë explains, ...

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 ...

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.

The fossils can be found in large clusters, which may indicate either mass mortality events or that they were very common ammonites. The ribs of these ammonites are close together and lean forwards ...