Blastoid, ‘cystoid,’ and crinoid fossils (phylum Echinodermata) are described for Silurian strata of west-central Ohio. These fossils are from the Cedarville Member of the Laurel Limestone, which is a dolostone rock. All that is preserved in the dolostone are molds and casts of these echinoderms. In the Midcontinent, these rocks were formed in a series of reef and reef-related environments, but the poor preservation of the fossils has hampered their understanding. Crinoids were an important faunal element in these Silurian strata, so this paper is an important step in developing an understanding of these ancient seas. Eleven taxa are described in this fauna, with two new crinoid species.

A diverse echinoderm fauna lived in reef and non-reef Silurian facies of the upper Midwestern USA. However, these faunas are dominantly preserved in dolostones with moldic preservation, and fossils from dolostone facies have not been documented to the extent of Silurian crinoids in nondolostone strata. Herein, an echinoderm fauna is described from the dolostones of the Cedarville Member of the Laurel Limestone (Wenlock, Homerian) from the Pepcon Cement Quarry in west-central Ohio. The described fauna contains blastoids, hemicosmitoids, and crinoids, including Troosticrinus subcylindricus (Hall and Whitfield, 1875); Caryocrinites sp. indet.; an unidentifiable diplobathrid camerate; Periechocrinus tennesseensis (Hall and Whitfield, 1875); Periechocrinus egani? (Miller, 1881); Stiptocrinus farringtoni (Slocom, 1908); Calliocrinus primibrachialis Busch, 1943; Calliocrinus poepplemani new species; Calliocrinus hadros new species; and Lecanocrinus sp. indet. Generic concepts for the Eucalyptocrinitidae are clarified; and, surprisingly, Eucalyptocrinites Goldfuss, 1831 is absent from this fauna. Additionally, lectotypes and paralectotypes are designated for Periechocrinus tennesseensis and Calliocrinus primibrachialis.