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Name:
Cosmoceras proniae
Age: Jurassic
Formation: Callovian Layers
Location: Michailov, Russia
Size: Largest ammonite is 1.6 inches across
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Here is a colorful plate of ammonites from the Jurassic of Russia. There are three gorgeous specimens of Cosmoceras proniae on the concretionary matrix. This type of ammonite has many, many ribs and a sharp keel. All three of the ammonites are very 3-dimensional and exhibit fine detail. The inner whorls of all three cephalopods are easily seen. Perhaps the most striking feature of this piece is the color of the fossils. The ammonites retain the nacreous shell and are wonderfully iridescent, almost looking metalic. The fossils also have pyrite preserved on them (hard to see in photo). The ammonites are aesthetically perched on the sculpted matrix base. This is a stunning plate of extremely colorful ammonites.
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