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This is the Ammolite Negative of a 73.5-Million-Year-old Cephalopod that was a fast-moving nektonic carnivore that hunted fish and other mollusks in the ancient Western Interior Seaway of North America. Their shells could reach 1 meter in size, they were involute (grew over the top of their old shell), and their inner phragmocone sections display both its suture patterns and original shell iridescence called Ammolite.
