Exogyra costata (Say 1871) showing damage to growth lines.
Exogyra costata (Oyster)
Exogyra costata are commonly found in the Cretaceous strata in northeast Mississippi. This example from the Dunn-Seiler Museum shows damage to the growth lines that were repaired as the creature grew.
66 million years
Prairie Bluff Formation (Chalk)
Creative Commons Attribution Non-Commercial No Derivatives license
Moe-Hoffman, A. (collector), “Exogyra costata (Say 1871) showing damage to growth lines.,” Mississippi State University Libraries, accessed February 5, 2023, https://msstate-exhibits.libraryhost.com/items/show/1349.
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