Comments: Scale Bar is 0.5 mm. Dayton Area, Ordovician Silurian Boundary -- teaching materials courtesy of Jeff Bauer. Sa element of Phragmodus undatus. Lateral costae, symmetrically disposed on each side of the cusp. -- BN1A04M04 and 5 were photographed dry under large microscope using Sony DSC-S70 using lateral illumination. Image BN1A04M06 shows effects of progressive whitening by exposure to vaporized ammonium chloride -- enhancing the appearance of the lateral costa. An even better result was obtained using blue water color dye with BN1A04M07 (although dye caused some effacement of denticles).
Page established 9-31-2002, updated 2-19-2003
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