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Ammonites were free-swimming mollusks of the ancient oceans, living around the same time that the dinosaurs walked the Earth and disappearing during the same extinction event. They came in a range of sizes, from tiny species only a couple of centimeters across, to large ones reaching over two meters in diameter. The animal would have lived in the last and largest of a chain of spiraled chambers. Filling these chambers with fluid or gas allowed the ammonite to sink like a stone to avoid predators, though ammonite shells with tooth marks on them have been found, evidence that it didn't always work. Fossilized shells are usually, but not always, beautiful spirals.
- Small: Approx. 35 mm x 25 mm
- Medium: Approx. 55 mm x 40 mm
- Large: Approx. 60 mm x 50 mm
*This fossil is genuine and no two are exactly alike. The item you receive may have slight variations from the one photographed. The last picture is an example of possible variations. If you wish to see the item before purchase, please email us at firstname.lastname@example.org.