7.5" Ammonite (Arnioceras) Cluster - Holderness Coast, England

This is a 7.5" wide cluster of Lower Jurassic ammonites (Arnioceras semicostatum). It was collected from the Holderness Coast in East Yorkshire, England. There are about six visible ammonites ranging from .6 to 2.3" across which have been nicely prepared from the hard limestone.

Comes with a 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.
What an ammonite would have looked like while alive.
Arnioceras semicostatum
Holderness Coast, East Yorkshire, England
Semicotatum Zone
Cluster 7.5 x 4.2 x 2.2", Largest ammonite 2.3"
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