Conodont P4J09

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: Lower bar shows oil-immersion detail of laminated structure from base of element, including helical arrangements of cells. Possibly a vascular structure? Contract of photomicrograph was enhanced by taking blank field, converting to negative and subtracting with about 35% transparancy to removing diffraction rings and CCD imperfections.