| Country of Origin | United States |
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Check the listing for details. Fossilized Tuna Vertebra (Thunnus sp.) 2.24 x 1.60" Bony Fish Fossil Oligocene. Condition: Used, Made in United States. Listed at 59.99 USD. Species: Thunnus sp. Their fossils are most commonly identified bycylindrical, boxy vertebrae that feel remarkably heavy for their size—often described as having a "stony" or "ivory-like" mineral density.