15" Honey-Orange Ammonite (Argonauticeras) - Befandriana, Madagascar

This is not one of your typical Madagascar ammonites, it is a rare Argonauticeras from Befandriana in Northern Madagascar. The chambers are filled with a gorgeous, honey/orange colored agate. It has been sliced in half and polished to reveal the inner chamber detail.

Each half is accompanied by a metal 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.
Argonauticeras sp.
Befandriana, Northern Madagascar
15" wide (each half)
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