Lot 645
Complete Giant Ammonite, Over 90 Million Years Old. A 9½ inch diameter example of Sphenodiscus lenticularis from the Cretaceous period, over 90 million years ago. Ammonites are related to the Chamber Nautilus but became extinct 65 million years ago with the demise of the dinosaurs. This beautiful example still has some of its original mother-of-pearl, which has toned from brown to irridescent red (red mother-of-pearl is now a gemstone called ammolite). Strength sutures show where the mother-of-pearl has worn off. Most ammonites are only 2 to 3 inches in diameter. Very large ammonites such as this one are highly valued by collectors. This one was found in Montana and sits upright against a solid stone matrix, making for an excellent display or even a book-end. Weight is 13 pounds.
Estimated Value $350 - 600.
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