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 -- P4J41X01.jpg
 -- P4J41X03.jpg
 -- P4J41S02.jpg
 -- P4J41S03.jpg
- Collected: Site
P, Liepers Shale from
Upper Ordovician in Nashville, Tennessee, USA.
- Estimated Age: about 450 million years old.
- Dimensions: scale bar is .5 mm
- Comments: Image 01 taken with overhead twin lateral illumination
before element was boiled. Other images taken as oil immersion darkfield.
Notice the early growth cones near the cusp, and slightly denticulated
flange next to cusp.
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