State Fossils
Idaho
Equus simplicidens (horse, Neogene) (Figure 3.60).
Montana
Maiasaura peeblesorum (hadrosaur dinosaur; Cretaceous) (Maiasaura Box).
Nebraska
Mammuthus columbi (Columbian mammoth; Neogene) (Figure 3.49).
North Dakota
Teredo Petrified Wood (petrified wood; Paleocene) (Figure 3.37).
South Dakota
Triceratops horridus (ceratopsian dinosaur; Cretaceous) (Figure 3.34A).
Wyoming
Knightia eocaena (fish; Eocene) (Figure 3.57).