11.45" Fossil Ammonite (Dactylioceras) Cluster - Hanging Presentation

This is a cluster of Dactylioceras ammonites from the Posidonia Shale of Germany. They have been compressed and are preserved on a black slate in a partially pyritized state. There is a large, partial Harpoceras ammonite along the left side of the plate. The back of this specimen has been epoxied and a single nail hanger hole has been installed for hanging presentation.

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.

Holzmaden, Germany
Posidonia Shale
Rock 11.45 x 7.95" Largest ammonite 3.3"
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