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Pen FormationThe Pen Formation is a Campanian-age geologic unit in the western United States. Vertebrate faunaSharks are well known from the Pen Formation.[1]
Other fishes include Xiphactinus,[1] the ray Ptychotrygon,[1] and gar.[1] The nodosaurid ankylosaurs Acantholipan and CPC 273 have also been found in the Pen Formation.[2] Footnotes
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