US State Fossils

Can you name the state fossils of the US?

As of 2026, Arkansas, Florida, Hawaii, Iowa, New Hampshire, and Texas all lack state fossils.

Source: Wikipedia

Clarifications: A vertebrate is an animal with a backbone, an invertebrate is an animal without a backbone, and trace fossils are remnants of organisms besides body parts.

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Last updated: March 20, 2026

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First submitted	March 9, 2026
Times taken	4
Average score	36.4%
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State + Geologic Time Period	Type	Answer
Alabama, Eocene	Vertebrate	Basilosaurus
Alaska, Pleistocene	Vertebrate	Woolly Mammoth
Arizona, Triassic	Plant	Petrified Wood
California, Pleistocene	Vertebrate	Smilodon
Colorado, Jurassic	Vertebrate	Stegosaurus
Connecticut, Jurassic	Trace Fossil	Dinosaur Tracks
Delaware, Cretaceous	Invertebrate	Belemnite
Georgia, Cretaceous-Miocene	Part of an animal	Shark Teeth
Idaho, Pleistocene	Vertebrate	Hagerman Horse
Illinois, Pennsylvanian (Carboniferous)	Invertebrate	Tully Monster
Indiana, Holocene	Vertebrate	American Mastodon
Kansas, Cretaceous (name either)	Vertebrate	Pteranodon / Tylosaurus
Kentucky, Ordovician-Pennsylvanian	Invertebrate	Brachiopod
Louisiana, Oligocene	Plant	Palmoxylon
Maine, Devonian	Plant	Pertica
Maryland, Miocene	Invertebrate	Ecphora
Massachusetts, Jurassic	Trace Fossil	Dinosaur Tracks
Michigan, Holocene	Vertebrate	American Mastodon
Minnesota, Pleistocene	Vertebrate	Castoroides
Mississippi, Eocene	Vertebrate	Zygorhiza
Missouri, Pennsylvanian	Invertebrate	Sea Lily
Montana, Cretaceous	Vertebrate	Maiasaura

State + Geologic Time Period	Type	Answer
Nebraska, Pleistocene (name any of the three)	Vertebrate	Woolly Mammoth / Columbian Mammoth / Imperial Mammoth
New Jersey, Cretaceous	Vertebrate	Hadrosaurus
Nevada, Triassic	Vertebrate	Shonisaurus
New Mexico, Triassic	Vertebrate	Coelophysis
New York, Silurian	Invertebrate	Eurypterus
North Carolina, Miocene-Pliocene	Vertebrate (or part of it)	Megalodon
North Dakota, Paleocene	Invertebrate + Plant	Shipworm / Petrified Wood
Ohio, Ordovician / Devonian (name either)	Invertebrate / Vertebrate	Isotelus / Dunkleosteus
Oklahoma, Jurassic	Vertebrate	Saurophaganax
Oregon, Eocene	Plant	Metasequoia
Pennsylvania, Devonian	Invertebrate	Phacops
Rhode Island, Paleozoic	Invertebrate	Trilobite (unspecified)
South Carolina, Pleistocene	Vertebrate	Columbian Mammoth
South Dakota, Cretaceous	Vertebrate	Triceratops
Tennessee, Cretaceous	Invertebrate	Pterotrigonia
Utah, Jurassic	Vertebrate	Allosaurus
Vermont, Pleistocene (name either)	Vertebrate	Beluga Whale / Woolly Mammoth
Virginia, Cenozoic	Invertebrate	Chesapecten
Washington, Pleistocene	Vertebrate	Columbian Mammoth
West Virginia, Pleistocene	Vertebrate	Megalonyx
Wisconsin, Silurian	Invertebrate	Calymene
Wyoming, Eocene	Vertebrate	Knightia