Colorado Agatized Dinosaur Bone Bracelet

This is a bracelet made from 150 million year old, polished, agatized dinosaur bone. The internal cell structure of the dinosaur bone can clearly be seen in the polished bone.

The bone may have come from any of the dinosaurs found in the Morrison Formation including Allosaurus, Apatosaurus, Brachiosaurus, Camarasaurus, Diplodocus, Stegosaurus, and Torvosaurus. While complete bones or even near complete bones are rare, tumbled fragments of bone are very common in sections of the Morrison Formation. Some of this bone has been agatized, replaced with silica instead of calcified.

Agatized or agate replaced dinosaur bone is a rare form of fossilized dinosaur bone where the original fossilized bone (typically permineralized with calcite) has been re-mineralized (replaced/substituted) with silica-type compounds (agate, jasper, chalcedony, or opal). In a unique and isolated circumstance, the strata on the Colorado Plateau were uplifted during the tertiary intrusions, about 35,000,000 years ago, when the San Rafael Swell and the La Sals, Henry, and Abajo Mountains were formed. As these ranges were forming, local strata layers were flooded with silica-rich, superheated groundwater. This provided the appropriate environment to begin the replacement of the calcite in the original fossils with silicates. The most prolific layers of gem bone come from the Morrison Formation which is late Jurassic in age.
Brushy Basin Member, Morrison Formation
Band Stretches
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