Sundance Formation

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The Sundance Formation is a western North American sequence of Upper Jurassic age^[1] marine shales, sandy shales, and sandstones.

The Sundance 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.

[edit] Vertebrate paleofauna

Pterosaurs of the Summerville Formation
Taxa	Presence	Description	Images
Ichnogenus: Pteraichnus^[2] P. stokesi^[2]	Found in Wyoming at the Alcova/Grey Reef Reservoir, Seminoe Reservoir, and Bighorn Canyon National Recreation area.^[2] 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] Specimens housed at University of Wyoming, Laramie.^[2]

Belemnoids of the Summerville Formation
Taxa	Presence	Description	Images
Genus: Belemnites B. densus

^ 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.
^ ^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.

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