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This picture shows a petrified wood like fossil of a root. The fossils were found just below the sandstone layer preserving the Johnson Farm Dinosaur Tracks.
The soil contained a high concentration of calcium carbonate which occurs in an arid climate. The roots of plants became coated with a pure layer of the calcium carbonate. Over time the roots became fossilized into what is called rhizoliths or "root rocks". The calcium carbonate coating is called a rizoconcretion and eventually was replaced by colorful agate. The root rotted away leaving behind a colorful agate tube.