The ammonites became extinct at the end of the Cretaceous, at roughly the same time as the dinosaurs disappeared. However, we know a lot about them because they are commonly found as fossils formed when the remains or traces of the animal became buried by sediments that later solidified into rock.

Are there any ammonites alive today?

The first Nautiloids can be traced back to the Late Cambrian, whilst the Ammonites are believed to have originated in the Devonian geological period. There are two extant genera of Nautilus alive today. ... There is some evidence to suggest that a few types of Ammonite did indeed survive into the Age of Mammals.

Where are ammonites found in the world?

And while specimens have been found almost everywhere on the planet, Antarctica is well-known for its rich ammonite fossil sites. Among the most extraordinary ammonite species found in Antarctica is Diplomoceras cylindraceum, which could grow up to 2 meters long and is noted for its paperclip-shaped, uncoiled shell.