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Phylum Mollusca, Class Bivalvia, organisms with two valves


An oyster patch specimen number 19TX7, very similar to those you might see today on the Gulf coast.

One of the more common fossil bivalves in NPL's Cretaceous collections is the oyster Exogyra. This fine specimen of Exogyra ferox from the Type collection still has both valves (halves) of its shell.  Oysters are often preserved as fossils, probably because their shells are thick, hard, and composed of stable calcite, and because they lead a 'cemented' lifestyle.

Exogyra ferox 'lid' with drill holes
Exogyra ferox pair of valves closed
Exogyra ferox valves open
label for this type specimen



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