Comments: Scale Bar is 0.5 mm. Dayton Area, Ordovician Silurian Boundary -- teaching materials courtesy of Jeff Bauer. This represents the Sc element of Phragmodus undatus. The anterior keel on the cusp is turned inward; no lateral costae. Images 05 and 05 taken dry with large microscope using DSC-S70.
Page established 9-22-2002, updated 9-22-2002
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