Study of more than 500 holothurian sclerites from water-washed shales in the Lower Mississippian Rockford limestone formation of Jasper County, Indiana, reveals four genera and ten species of which the following four species are new: Thuroholia spicatus, Achistrum brevis, Microantyx botoni, and Rota campbelli. The fauna bears resemblance to holothurian remains from the Lower Mississippian Escabrosa limestone of southern Arizona and the Lower Carboniferous of Scotland.

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