5.8" Rare Ammonite (Arnioceras) Cluster - Holderness Coast, England

This is a 5.8" wide cluster of rare, Lower Jurassic ammonites (Arnioceras semicostatum). It was collected from the Holderness Coast in East Yorkshire, England. There are over twenty ammonites ranging from .4 to 2.7" across which have been nicely prepared from the hard limestone.

Comes with a 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.

What an ammonite would have looked like while alive.
What an ammonite would have looked like while alive.
Arnioceras semicostatum
Holderness Coast, East Yorkshire, England
Planorbis Zone
Cluster 5.8 x 5 x 1.8", Largest ammonite 2.7"
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