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The Pen Formation is a Campanian-age geologic unit in the western United States.
Sharks are well known from the Pen Formation.[1]
- Lonchidion selachos[1]
- Squalicorax kaupi[1]
- Cretorectolobus olsoni[1]
- Ischyrhiza mira[1]
- Scapanorhynchus texanus[1]
- S. raphiodon[1]
- Cretolamna appendiculata[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]
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