Trachodon mummy

The Trachodon mummy is a fossilized natural mummy of Edmontosaurus annectens (originally known as Trachodon annectens), a duckbilled dinosaur. One of the finest dinosaur specimens so far discovered, it was the first including a skeleton encased in skin impressions from large parts of the body. This specimen has considerably influenced the scientific conception of duckbilled dinosaurs. Skin impressions found in between the fingers have been interpreted as evidence for an aquatic lifestyle; this hypothesis is now rejected. The mummy was found by fossil hunter Charles Hazelius Sternberg and his three sons near Lusk, Wyoming, United States in 1908. Although Sternberg was working under contract to the British Museum of Natural History, Henry Fairfield Osborn of the American Museum of Natural History managed to secure the mummy.

The Trachodon mummy was discovered and excavated in 1908 by Charles Hazelius Sternberg and his three sons George, Charles Jr. and Levi. An independent fossil collector, Sternberg offered his finds various museums in North America and Europe for sale. The sons worked as assistants for their father, but later ascended to renowned paleontologists. Early in 1908, Sternberg planned an expedition to the Lance Creek area in eastern Wyoming, where the family had not worked before. In search for acquirers of potential fossil finds, he wrote to the British Museum of Natural History that he would know where in Wyoming to find a skull of the horned dinosaur Triceratops, knowing that the museum was lacking a good specimen; the museum agreed to buy up any good fossil finds if such would be made. Finally, the Sternberg expedition left its family residence in Kansas in early spring, and arrived in the Lance Creek area in July. Sternberg's plan foresaw the exploration of an uninhabited area of approximately 1000 square miles (2590 km²) north to the North Platte River and south to the Cheyenne River in Converse County (today Niobrara County). The predominant badlands of this area expose sedimentary rocks of the Maastrichtian stage of the Upper Cretaceous, which today are known as the Lance Formation. The area had already been intensively explored by paleontological expeditions; before the start of his expedition, Sternberg learned that the American Museum of Natural History was unsuccessfully working in the area for years.

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