Name:
Jeletzkytes spedeni
Age: Cretaceous
Formation: Fox Hills Formation
Location: South Dakota
Size: Ammonite is almost 5 inches across!
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This is an absolutely beautiful ammonite fossil. It is a fabulous specimen of Jeletzkytes spedeni from the Cretaceous of South Dakota. This type of ammonite has faint ribbing and a somewhat rounded keel. There are several rows of prominent nodes on the shoulders and near the keel of the ammonite. These features are very clearly defined on this specimen. But the most striking feature of this ammonite is its amazing natural color. The iridescence of this ammonite is simply awesome. It flashes a full rainbow of colors and is almost opalescent in nature. Believe it or not, it is even more brilliant in person! Also, the ammonite is HUGE, extremely 3-dimensional, and complete all the way to the aperture. The specimen is wonderfully positioned on a large, natural block of dense, concretionary matrix. This is one of the most colorful iridescent US ammonites we have ever had. And it is also one of the largest of this type we have ever seen. (Second photo was taken to show detail, not color.)
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