|
 -- BN1A04X01
 -- BN1A04X01
 -- BN1A04S03
BN1A04M04 --   -- BN1A04M05
 -- BN1A04M06
 -- BN1A04M07
- Estimated Age: about 450 million years old.
- 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).
|