3.4" Cretaceous Ammonite (Sphenodiscus) Fossil

Cretaceous Ammonite (Sphenodiscus) Fossil #113160

This is a 3.4" wide, Cretaceous Period, Sphenodiscus lobatus ammonite fossil, collected from the Escondido Formation of Ojinoga, Mexico. The rock surrounding this ammonite has completely been removed, along with much of the shell. This unusual specimen came out of an old collection we purchased.

It comes with an acrylic display stand.

Ammonites were predatory cephalopod mollusks that resembled squids with spiral shells. They are more closely related to living octopuses, though their shells resemble that of nautilus species. True ammonites appeared in the fossil record about 240 million years ago during the Triassic Period. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

What an ammonite would have looked like while alive.

More about ammonites