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Marc Behrendt
421 South Columbus Street
Somerset, Ohio, 43783 USA
(740) 743-2818

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       This is an extraordinarily rare trilobite, found in the black shale layers of the Liberty Hall Formation.  It is often found associated with graptolites.  Porterfieldia is related to Triathrus.

         This specimen is complete, though it is difficult to discern in the image.