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Official State Fossils and Dinosaurs

The State Fossils/Dinosaurs, Listed by State


Official state fossils or state dinosaurs have been named by 39 of the 50 states. (Maryland, Missouri and Wyoming have named one of each.) There is also the informally named but formally designated "Capitalsaurus" of Washington, DC.

The state fossils make a much more consistent list than the state rocks, state minerals and state gemstones do—most are distinct creatures identified by species. On the other hand, some of the dinosaurs are honored as state fossils rather than state dinosaurs. You can look up each of the geologic age terms in the geologic time scale.

My colleague, Dinosaurs Guide Bob Strauss, has created profiles of many of these creatures; click the species name to see them.

The "source" link usually goes to the best existing material from the respective state government. My favorite site for all state symbols, not just fossils, is netstate.com.

Alabama: Basilosaurus cetoides (Eocene whale) (source)
Alaska: Mammuthus primigenius (Pleistocene mammoth) (source)
Arizona: Araucarioxylon arizonicum (Triassic tree) (source)
California: Smilodon californicus (Quaternary sabertooth cat) (source)
Colorado: Stegosaurus (Cretaceous dinosaur) (source)
Connecticut: Eubrontes giganteus (Jurassic dinosaur track) (source)
Delaware: Belemnitalla americana (Cretaceous sea pen) (source)
Georgia: Shark tooth (Cenozoic) (source)
Idaho: Equus simplicidens (Pliocene horse) (source)
Illinois: Tullimonstrum gregarium (Carboniferous creature) (source)
Kentucky: Brachiopod (Paleozoic shellfish) (source)
Louisiana: Palmoxylon (Oligocene palm) (source)
Maine: Pertica quadrifaria (Devonian plant) (source)
Maryland: Astrodon johnstoni (Cretaceous dinosaur) (source) and Ecphora gardnerae (Miocene snail) (source)
Massachusetts: Dinosaur tracks (Triassic) (source)
Michigan: Mammut americanum (Pleistocene mastodon) (source)
Mississippi: Basilosaurus cetoides and Zygorhiza kochii (Eocene whales) (source)
Missouri: Delocrinus missouriensis (Carboniferous crinoid) (source) and Hypsibema missouriense (Cretaceous dinosaur) (source)
Montana: Maiasaura peeblesorum (Cretaceous dinosaur) (source)
Nebraska: Archidiskodon imperator (Pleistocene mammoth) (source)
Nevada: Shonisaurus popularis (Triassic ichthyosaur) (source)
New Jersey: Hadrosaurus foulkii (Cretaceous dinosaur) (source)
New Mexico: Coelophysis bauri (Triassic dinosaur) (source)
New York: Eurypterus remipes (Silurian sea creature) (source)
North Dakota: Teredo petrified wood (Cretaceous and Tertiary) (source)
Ohio: Isotelus (Ordovician trilobite) (source)
Oklahoma: Saurophaganax maximus (Jurassic dinosaur) (source)
Oregon: Metasequoia (Cenozoic tree) (source)
Pennsylvania: Phacops rana (Devonian trilobite) (source)
South Carolina: (a href="http://dinosaurs.about.com/od/mesozoicmammals/p/mammuthus.htm">Mammuthus columbi (Pleistocene mammal) (source)
South Dakota: Triceratops (Cretaceous dinosaur) (source)
Tennessee: Pterotrigonia thoracica (Cretaceous shellfish) (source)
Texas: Pleurocoelus* (Cretaceous dinosaur) (source)
Utah: Allosaurus (Jurassic dinosaur) (source)
Vermont: Delphinapterus leucas (Pleistocene whale) (source)
Virginia: Chesapecten jeffersonius (Neogene shellfish) (source)
Washington: Mammuthus columbi (Pleistocene mammoth) (source)
West Virginia: Megalonyx jeffersoni (Pleistocene ground sloth) (source)
Wisconsin: Calymene celebra (Paleozoic trilobite) (source)
Wyoming: Knightia (Paleogene fish) (source) and Triceratops (Cretaceous dinosaur) (source)

*Pleurocoelus may be renamed Paluxysaurus—keep up with developments at Bob Strauss' About Dinosaurs site.

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