Knightia eocaena

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Species: Knightia eocaena.

Age: ~50 million years.

Period: Eocene.

Origin: Wyoming, United States.

Size: 6-8 cm.

Description: One of the most prolific fossils from the Green River Formation. Its diet consisted of plankton and small crustaceans. Of great importance for understanding the evolution of fish in the Eocene.