English: Triarthrus eatoni, a trilobite, family Olenidae, order Ptychopariida, exposed from the ventral side, collected from the Frankfort Shale, Sixmile Creek in Cleveland's Glen, near Rome, Oneida Co., New York, USA, from the Upper Ordovician (Caradoc, 458 to 448 mjo) showing the biramous appendages and antennae deposited as pyrite.
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