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| Exogyra Ponderosa |
The image above is a picture of the Exogyra Ponderosa, an extinct marine oyster. They can bring as much as $60 if you buy one (online). I found this one many years ago. It's 3.5 inches wide and 5.5 inches in length. It's in perfect condition. I'll never get rid of this one, as it was my first (personally) greatest find. Online, they cost at least $25. They're dated to the Jurassic and Cretaceous periods.
