Fossil Cabin near Como Bluff, Wyoming has walls constructed with thousands of dinosaur bones. The fossils are derived from the Upper Jurassic Morrison Formation, a widespread nonmarine unit in western America that is relatively rich in dinosaur remains. According to on-site signage, 5,796 dinosaur bones weighing a total of 112,000 pounds are in the walls of Fossil Cabin,
Some of the bones have a bluish coloration, likely derived from vivianite, a hydrous iron phosphate mineral. Upon weathering, and in the presence of iron, phosphate-rich materials such as fossil teeth, fossil bones, and phosphorites develop bluish vivianite weathering films.
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