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Name:
Perisphinctes sp., Cosmoceras proniae
Age: Jurassic
Formation: Callovian Layers
Location: Michailov, Russia
Size: Largest ammonite is about 2 inches across
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This is an absolutely beautiful block of ammonites. These ammonites are Perisphinctes and Cosmoceras from the Jurassic Period of Russia. There are four gorgeous ammonites clustered together on the large block of limestone, the largest being almost two inches across. Perisphinctes has a deep, distinct ribbing pattern - this feature is easily seen on these examples. All of the ammonites are extremely robust and exhibit very fine detail - even the tiny inner whorls of the ammonites are wonderfully displayed! The ammonites have brilliant natural coloration - they even retain the highly iridescent, mother-of-pearl shell (the rainbow of colors are much more vibrant in person than what the pictures show). The ammonites are beautifully showcased on the sculpted block of concretionary matrix. This is a fabulous display plate of iridescent ammonites from Russia.
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