A shell that displays the Fibonacci spiral. Fibonacci's sequence and phi are important mathematical concepts (especially in biology) in the same way Planck's constant is important to Quantum Mechanics. Cut Nautilus, Fibonacci Spirals, Henry Domke, Fibonacci Sequences, Pears Nautilus, Chamber Nautilus, Mathematics Concept, Seashells, Nautilus Shells
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ammonite: Per Wikipedia the ammonites went extinct with Dinosaurs 65 million years ago. Ammonites survived until the end of the Cretaceous period in a sea that covered what is now Alberta. Canada and Montana, USA. These ammonites were transformed into the rare gem known as Ammolite.