List of State Fossils
| State | Age | Common name | Binomial nomenclature |
Image | Adoption date |
|---|---|---|---|---|---|
| Alabama | Eocene | Basilosaurus whale | Basilosaurus cetoides | 1984 | |
| Alaska | Pleistocene | Woolly Mammoth | Mammuthus primigenius | ||
| Arizona | Triassic | petrified wood | Araucarioxylon arizonicum | ||
| California | Pleistocene | Saber-toothed cat | Smilodon fatalis | ||
| Colorado | Jurassic | Stegosaurus | Stegosaurus armatus | 1982 | |
| Connecticut | Jurassic | dinosaur tracks | Eubrontes giganteus | ||
| Delaware | Cretaceous | Belemnite | Belemnitella americana | ||
| District of Columbia | Cretaceous | "Capitalsaurus" (state dinosaur) |
nomen nudum only | ||
| Florida | Eocene | agatized coral (state stone) |
Cnidaria, Anthozoa | ||
| Georgia | Cretaceous– Miocene |
shark tooth | undetermined | ||
| Idaho | Pliocene | Hagerman horse | Equus simplicidens | ||
| Illinois | Pennsylvanian | Tully Monster | Tullimonstrum gregarium | ||
| Kentucky | Ordovician– Pennsylvanian |
brachiopod | undetermined | 1986 | |
| Louisiana | Oligocene | petrified palmwood | Palmoxylon | ||
| Maine | Devonian | Pertica plant | Pertica quadrifaria | ||
| Maryland | Miocene | murex snail / gastropod | Ecphora gardnerae gardnerae |
||
| Massachusetts | Jurassic | dinosaur tracks | Eubrontes Giganteus | ||
| Michigan | Holocene | American mastodon | Mammut americanum | 2002 | |
| Mississippi | Eocene | Basilosaurus and Zygorhiza whales |
Basilosaurus cetoides Zygorhiza kochii |
||
| Missouri | Pennsylvanian | Sea lily | Delocrinus missouriensis | 1989 | |
| Montana | Cretaceous | Duck-billed dinosaur | Maiasaura peeblesorum | ||
| Nebraska | Pleistocene | Woolly Mammoth Columbian Mammoth Imperial Mammoth |
Mammuthus primigenius Mammuthus columbi Mammuthus imperator |
||
| Nevada | Triassic | Shonisaurus | Shonisaurus popularis | ||
| New Jersey | Cretaceous | duck-billed dinosaur | Hadrosaurus foulkii | ||
| New Mexico | Triassic | Coelophysis | Coelophysis bauri | ||
| New York | Silurian | sea scorpion | Eurypterus remipes | 1984 | |
| North Dakota | Paleocene | shipworm-bored petrified wood |
Teredo petrified wood | ||
| Ohio | Ordovician | trilobite | Isotelus maximus | 1985 | |
| Oklahoma | Jurassic | Saurophaganax | Saurophaganax maximus | ||
| Oregon | Eocene | Dawn redwood | Metasequoia glyptostroboides |
2005 | |
| Pennsylvania | Devonian | trilobite | Phacops rana | 1988 | |
| South Dakota | Cretaceous | Triceratops | Triceratops horridus | ||
| Tennessee | Cretaceous | bivalve | Pterotrigonia thoracica | ||
| Texas | Cretaceous | Pleurocoelus (state dinosaur) |
Pleurocoelus nanus | ||
| Utah | Jurassic | Allosaurus | Allosaurus fragilis | 1988 | |
| Vermont | Pleistocene | Beluga whale | Delphinapterus leucas | 1993 | |
| Virginia | Caenozoic | scallop | Chesapecten jeffersonius | 1993 | |
| Washington | Pleistocene | Columbian Mammoth | Mammuthus columbi | 1998 | |
| West Virginia | Late Pleistocene | Jefferson's ground sloth | Megalonyx jeffersonii | 2008 | |
| Wisconsin | Ordovician– Silurian |
Trilobite | Calymene celebra | 1985 | |
| Wyoming | Eocene | Knightia | Knightia | 18 February 1987 |
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