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This necklace is made from small, agatized ammonite fossils which have been cut in half and polished to reveal all of the detail of the inner chambers. It's a real cool fossil that would make a great gift or could even be used to make jewelry. These ammonites range from 1 1/4 to 1 1/2" wide (each half)
The ammonites are Middle Cretaceous in age, or approximately 110 million years old and collected from the Mahajanga Province of Madagascar. 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.