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This is the lower valve of a juvenile oyster, Ostrea compressirostra. Note the detailed impression of another bivalve, Volsella alabamensis. Apparently, the oyster grew on top of the Volsella shell, which was not preserved. The name Volsella alabamensis is from Index Fossils of North America, by H. W. Shimer and R. R. Shrock. The original name was Modiolus alabamensis. The length is 4 cm.
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