Ancient Fibonacci.

This is half of an ammonite fossil. Perfecting its plainisprial from about 3 million years ago to 145 million years ago, these mollusks became the ancestors of present day Coleoids like cuttlefish, squid and octopus. These spirals are the perfect golden ratio for my brain to think about. Fascinating.

Ammonite fossil set in sterling. 

Size 10 1/2

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