The Sundance Formation is a western North American sequence of Upper Jurassic age[1] marine shales, sandy shales, and sandstones. The formation underlies the western North American Morrison Formation, the most fertile source of dinosaur fossils in the Americas, and is separated by a disconformity from the underlying Upper Triassic Chugwater Formation red beds. The Sundance Formation is known for fossils of an extinct species of marine cephalapod, Belemnites densus.

Vertebrate faunaEdit


Pterosaurs of the Sundance Formation
Taxa Presence Description Images


  1. P. stokesi[2]
  • Found in Wyoming at the Alcova/Grey Reef Reservoir, Seminoe Reservoir, and Bighorn Canyon National Recreation area.[2]
  1. Found in Wyoming, at the ichnospecies' type locality.[2]
  • Alcova/Grey Reef Reservoir and Seminoe Reservoir housed at University of Wyoming, Laramie.[2] Alcova/Grey Reef Reservoir specimens are also housed at Tate Museum, Casper College.[2]
  1. Specimens housed at University of Wyoming, Laramie.[2]

Invertebrate paleofaunaEdit


Belemnoids of the Sundance Formation
Taxa Presence Description Images


  1. B. densus


  1. ^ Jennings, Debra S.; Stephen T. Hasiotis (2006). "Taphonomic analysis of a dinosaur feeding site using Geographic Information Systems (GIS), Morrison Formation, Southern Bighorn Basin, Wyoming, USA". Palaios (SEPM Society for Sedimentary Geology) 21 (5): 480–492. doi:10.2110/palo.2005.P05-062R.
  2. ^ a b c d e f g Lockley, M.; Harris, J.D.; and Mitchell, L. 2008. "A global overview of pterosaur ichnology: tracksite distribution in space and time." Zitteliana. B28. p. 187-198. ISSN 1612 - 4138.
Mantell's Iguanodon restoration

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