6.35" Silver Iridescent Ammonite (Cleoniceras) Fossil - Madagascar
Here's a beautiful silver iridescent ammonite fossil quarried near Mahajanga Province, Madagascar. It is of the genus Cleoniceras which inhabited the shallow seas approximately 110 million years ago. If you catch it in the right light or particularly if it is wet, the fossil shines with a brilliant iridescence. It comes with an acrylic display stand.
Ammonites were predatory mollusks that resembled a squid with a shell. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus. Ammonites appeared in the fossil record about 240 million years ago and they barely survived several major extinction events. The last lineages disappeared 65 million years ago at the end of the Cretaceous.