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He published papers on fossilized tracks in the Connecticut Valley, including Eubrontes and Otozoum, that were later associated with dinosaurs, though he believed, with a certain prescience, that they were made by gigantic ancient birds.
The Monuran trackway is a fossil trackway in the Robledo Mountains of New Mexico, produced by the extinct insect group called Monura, (meaning "one-tail"), from the Lower Permian.