Bivalve Fossil (F. Gryphaeidae)
(DSM# M157/FK319) Extinct genus of marine bivalve that lived on solid substrates.
66 million years
Prairie Bluff Fm. (Chalk)
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“Exogyra costata (Say 1971) Oyster left valve - interior and exterior,” Mississippi State University Libraries, accessed October 7, 2022, https://msstate-exhibits.libraryhost.com/items/show/1505.
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