Sb element of Phragmodus undatus
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BN1A05M04 -- -- BN1A05M05 -- BN1A05M06
- 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. Sb element of Phragmodus undatus. Lateral costae assymetrically disposed; cusp and element twisted. Photo BN1A05M04 was taken with the big microscope, and shows the cross-section shape of the cusp and costae. The oral costa actually corresponds to point A, and the aboral costa to point B. The same picture was taken again as a mosaic for BN1A05M05, and rotated downward for BN1A05M06 to show the cross section of the large denticle. BN1A05M07 was painted with water color China White. This non-trasparent color did not wsh off completely, and was an unfortunate choice. Depth-of-field distortion ruins stereoscopic image from large microscope where were assembled from mosaic images. BN1A05M08 uses Windsor Blue as color which has the disadvantage of being rather granular and glittery.
Page established 9-22-2002, updated 3-01-2003
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