This Specimen has been sold.
6.4" Dactylioceras Ammonite Cluster - Posidonia Shale, Germany
This is a 6.4" wide cluster of Dactylioceras ammonite fossils from the Posidonia Shale of Germany. Ammonites from this location have been compressed and are preserved on a black slate in a partially pyritized state. 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. True ammonites appeared in the fossil record about 240 million years ago. The last lineages disappeared 65 million years ago at the end of the Cretaceous.