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This study provides the first documentation of microendolithic borings made by cyanobacteria, algae, and fungi in invertebrate skeletons from the Late Ordovician of eastern North America. Samples from the upper Mohawkian to Cincinnatian Series (Katian Stage, Caradoc to lower Ashgill of traditional usage) limestones and calcareous shales of Ohio, Indiana, and Kentucky were selected for study, because...
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