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The fossil shells in this photo look much like clams or oysters, but they are remains of a totally different group of organisms. What are they?


These are fossils of brachiopods. While they look like relatives of clams and oysters, they belong to a totally different phylum, with a totally different internal structure.
Brachiopods are still around today, but they are not nearly as common as they were when this limestone was deposited.