1.4" Corythosaurus Fossil Rib Bone Judith River FM Cretaceous Dinosaur Montana COA Tyrannosaurus These vibrant yellow sulfur crystals

These vibrant yellow sulfur crystals from Louisiana owe their existence to a daring underground process where bacteria reduce anhydrite in the caprock

Alternatively

3 mm in larger specimens

Some types can glow blue or red under UV light

which allowed them to be easily preserved as fossils

1.4" Corythosaurus Fossil Rib Bone Judith River FM Cretaceous Dinosaur Montana COA Tyrannosaurus These vibrant yellow sulfur crystalsLocation: Judith River Formation, Central Montana (Private Land Origin) Weight: 0. 9 Ounces Dimensions: 1. 4 Inches Long, 1. 4 Inches Wide, 0. 9 Inches Thick Comes with a Certificate of Authenticity. The item pictured is the one you will receive. Late Cretaceous, 83 million years old. Name: Corythosaurus Type: Herbivore Size: 9 meters in length. Corythosaurus is a genus of hadrosaurid, or duck billed, dinosaurs that lived during the Upper Cretaceous