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Jurassic
Morrison Formation
Utah, U.S.A.
Coprolites, the fossilized excreta of animals, can usually be recognized by their shape. While assumptions can be made about the size of the animal that produced them, the animal itself invariably cannot be identified. This is unfortunate since food fragments are often identified in coprolites, and much could be learned from this fossil evidence about ancient food chains. This specimen is a multicolored quartz in which vegetable fibers are present. The colors in the photograph have nothing to do with the original colors of the excrement.