Interesting info here:
https://www.britannica.com/animal/Gryphaea
"Gryphaea. Gryphaea, extinct molluskan genus found as fossils in rocks from the Jurassic Period to the Eocene Epoch (between 199.6 million and 33.9 million years ago). Related to the oysters, Gryphaea is characterized by its distinctively convoluted shape."
Amazing to think these things could be 10s or 100s of millions of years old. Not exactly rare but pretty fascinating and nice to find.
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