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Pygidium (tail), 3.2 cm wide, of a trilobite Dipleura sp. collected by Jessie Wittmeyer, Collins, NY, from the Lower Windom Shale on his Erie 2 BOCES, Ormsby Ctr. field trip to Penn Dixie on October 11, 2007.  Jessie donated the pygidium to the Penn Dixie Site.

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