2.3" Fossil Pyritized Ammonite (Hildoceras)- England

This is a 2.3" pyritized ammonite (Hildoceras), from Whitby, England. The original organic material has been replaced by pyrite. Under magnification the elaborate suture pattern of the inner shell is easily seen.

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.
What an ammonite would have looked like while alive.
Hildoceras bifrons
Whitby, England
2.3" wide
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