Trachodon, Troodon and Deinodon
In 1855 Ferdinand V. Hayden conducted a geological survey along the Judith River in Nebraska (now Montana). He found a large number of fossilized teeth, which were referred to Joseph Leidy for identification. Leidy identified and named 8 genera of which 3 turned out to be dinosaurs -
- Trachodon ('rough tooth') - a hadrosaur
- Deinodon - observed to be similar to Megalosaurus
These represent the first North American dinosaur discoveries
Hadrosaur-like teeth attributed to Trachodon, by Joseph Leidy 1860
1903 Restoration of Trachodon (Frederick Lucas)
For further discoveries on Trachodon, see The Trachodon Mummy 1908.