Pen Formation
The Pen Formation is a Campanian-age geologic unit in the western United States.
Vertebrate fauna
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 ankylosaur Acantholipan has also been found in the Pen Formation.[2]
Footnotes
- "Big Bend National Park," Hunt, Santucci, and Kenworthy (2006); page 65.
- Héctor E. Rivera-Sylva; Eberhard Frey; Wolfgang Stinnesbeck; Gerardo Carbot-Chanona; Iván E. Sanchez-Uribe; José Rubén Guzmán-Gutiérrez (2018). "Paleodiversity of Late Cretaceous Ankylosauria from Mexico and their phylogenetic significance". Swiss Journal of Palaeontology. in press. doi:10.1007/s13358-018-0153-1.
References
- Hunt, ReBecca K., Vincent L. Santucci and Jason Kenworthy. 2006. "A preliminary inventory of fossil fish from National Park Service units." in S.G. Lucas, J.A. Spielmann, P.M. Hester, J.P. Kenworthy, and V.L. Santucci (ed.s), Fossils from Federal Lands. New Mexico Museum of Natural History and Science Bulletin 34, pp. 63–69.
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