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The corals constitute an abundant and important group of invertebrates in the Middle Devonian rocks of Ohio. In point of species they are exceeded only by the brachiopods and possibly by the gastropods. Stratigraphically they range through the Middle Devonian limestone and calcareous shale formations. They are especially characteristic of the Columbus limestone horizon, and zone C of this formation is known as the “coral zone” because of the great abundance of corals in it. In places it constitutes a true coral reef. The approximate time equivalents of the Columbus limestone—the Onondaga formations of Kentucky, New York, and Ontario—also have a notable development of corals.

This study is an attempt to bring together the data on the Devonian corals of our State which are scattered literally through scores of publications, to revise many specific descriptions, to describe new forms, and to summarize and untangle where possible the maze of synonymy which submerges the identity of many genotypes. The ecologic distribution has not been discussed. The stratigraphic distribution has been worked out in a measure, but to satisfy the refinements of correlation required in modem work much greater detail of stratigraphic distribution is necessary.

During the progress of this study the writer has had at her command the fairly extensive coral collection in the Geological Museum at The Ohio State University. In addition, various museums in the State housing geological collections have been visited, as well as the geological museums at the University of Chicago, . . .

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