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In 2005 the Oregon state legislature adopted the fossils of the dawn redwood or Metasequoia as the Oregon state fossil.

In 1982 the Colorado state legislature designated the fossils of Stegosaurus as the Colorado state fossil.

A large, hollow cavity in the rear end of some dinosaurs has been postulated to contain a second brain. But, is this just a myth?

In 1985 the Utah state legislature designated fossils of Calymene celebra, a type of trilobite as the Wisconsin state fossil.

In 2008 the West Virginia state legislature designated the giant ground sloth (Megalonyx jeffersonnii) as the West Virginia state fossil.

In 1991 the Connecticut state legislature designated fossil, theropod dinosaur tracks found in the Connecticut Valley as their state fossil.

In 1994 the Maryland state legislature designated the Gastropod (Ecphora gardnerae gardnerae) as the Maryland state fossil.

In 1988 the Idaho state legislature designated the Hagerman Horse (Equus simplicidens) as the Idaho state fossil.

In 1989 the Illinois state legislature designated the Tully Monster (Tullimonstrum gregarium) as the Illinois state fossil.

While Arkansas does not officially have a state fossil it does have a state dinosaur. Arkansaurus was designated as the state dinosaur in 2017.