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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.
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