An abundant fauna of corals from the Gilmore City Limestone of north-central Iowa includes Lithostrotionella microstyla, Vesiculophyllum sedaliense, Pleurodictyum expansum, and Syringopora surcularia, here systematically described and evaluated for stratigraphic correlation. The coral here designated as Vesiculophyllum has internal structures also characteristic of Caninophyllum and Kakwiphyllum, which may be considered synonyms. Lithostrotion and Lithostrotionella are related genomorphically. The Gilmore City Limestone is considered correlative with several Kinderhook and Osage formations of the Cordilleran and Mississippi Valley regions.

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