New Fossil Algae from the Middle Devonian of New York

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Abstract
An analysis of chert thin sections from the Middle Devonian rocks of New York State has shown both marine and freshwater algae to be present. Three new genera and species are described: PALEOOEDOGONIUM micrum n. g., n. sp., PALEOCLOSTERIUM leptum n. g., n. sp. and PALEODIDYMOPRIUM didymum n. g., n. sp. All three possess similarties to modern freshwater genera. The occurrence of fossil freshwater algae in only a limited number of geographical locations and the statewide presence of marine Hystrichosphaeridia in the rocks of all areas sampled supports the premise that the freshwater algae were floated into the marine waters of the ancient Onondaga sea rather than having changed their environment since Devonian time.

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