LOT OF 54 POLISHED AMMONITES

Ammonites appeared during the Silurian (435-410 million years ago) and were abundant in the Jurassic and Cretaceous seas (175 million years ago).

They are extinct members of the Cephalopod group.
Ammonite shells had hollow chambers separated by walls called septa. A tube called a siphuncle connected the body to the chambers, allowing the animal to fill them with water or air, changing its buoyancy to rise or fall in the ocean. Only the living animal occupied the last chamber.

Ammonnites are very important fossils for geological dating.
In some of the specimens from these lots, the natural sutures of the shell can be seen.