List of U.S. state fossils

Most American states have made a state fossil designation, in many cases during the 1980s. It is common to designate one species in which fossilization has occurred, rather than a single specimen, or a category of fossils not limited to a single species.

Four states (Indiana, Minnesota, New Hampshire, and Rhode Island) lack an explicit state fossil, though Indiana's Salem Limestone is a sedimentary rock that consists of dissolved calcium from both nonbiological and biological sources (such as the accumulation of corals and shells on the seafloor) and also often contains intact fossils.

States lacking a state fossil

 * Arkansas
 * Hawaii
 * Minnesota
 * The giant beaver was proposed in 2022.
 * Iowa
 * The crinoid was proposed in 2018.
 * New Jersey
 * New Hampshire
 * The American mastodon (Mammut americanum) was considered in 2015.
 * Rhode Island
 * Texas
 * The state dinosaur of Texas is Sauroposeidon proteles.