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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—Joseph I. C. Clarke (18461925)
“Sheathey call him Scholar Jack
Went down the list of the dead.
Officers, seamen, gunners, marines,
The crews of the gig and yawl,
The bearded man and the lad in his teens,
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—Joseph I. C. Clarke (18461925)
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“You can hardly convince a man of an error in a life-time, but must content yourself with the reflection that the progress of science is slow. If he is not convinced, his grandchildren may be. The geologists tell us that it took one hundred years to prove that fossils are organic, and one hundred and fifty more to prove that they are not to be referred to the Noachian deluge.”
—Henry David Thoreau (18171862)