Millions of years ago, Los Angeles was underwater, a vast prehistoric sea teeming with creatures that largely don't exist ...

Some ammonites had long, straight shells, while others had helix-shaped shells. Most species, however, had coiled shells lined with progressively larger chambers separated by thin walls called septa.

However, the identification of turtle shell rattles in prehistoric contexts can be quite challenging. Equifinality is a major problem for being able to distinguish rattles from food refuse, ...

So, while fossils of trilobite exoskeletons and ammonite shells are common, evidence of their soft parts aren’t. Fossils of these parts would allow palaeontologists to gather much more data about the ...