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400 Million Year Old Ammonite Pairs - S, M, L, XL Fossils

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Ammonites are an extinct group of molluscs that first appeared on Earth 400 million years ago. They died out 65 million years ago in the same mass extinction event that killed the dinosaurs. Ammonites likely ate plankton and were thought to occasionally be preyed upon by mosasaurs, a large type of aquatic reptile. They were a prevalent species and numerous fossils can be found. Sediment often settled into the chambers of the shell and petrified, forming crystallized sections of various colors.

Ammonites are one of the most easily observed examples of the appearance of the golden ratio in nature, also known as phi (1.618), along with the nautilus shell. The golden ratio appears throughout nature and has long fascinated philosophers. Many ancient sites are built to this proportion, including the Great Pyramid of Giza, and is generally found to be aesthetically pleasing.

Small: 2-3cm
Medium: 3-3.5cm
Large: 3.5-4.5cm
XLarge: 4.5-5cm

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5 out of 5 stars


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400 Million Year Old Ammonite Pairs - S, M, L, XL Fossils

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  • Handmade Supply
  • Craft type: Jewelry making
  • Material: Fossilized Ammonite Pairs
  • Feedback: 88 reviews
  • Favorited by: 54 people
  • Gift message available
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Shipping & returns

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From Sebastopol, CA
No returns or exchanges
But please contact me if you have any problems with your order. See return policy

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