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Bell Springs Formation
Bell Springs Formation
Stratigraphic range: Norian-Rhaetian; ~221–202 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Lithology
Primary	Sandstone
Location
Coordinates	43°00′N 108°48′W / 43.0°N 108.8°W
Approximate paleocoordinates	19°12′N 46°24′W / 19.2°N 46.4°W
Region	Wyoming
Country	United States
	Bell Springs Formation (the United States) Bell Springs Formation (Wyoming)

The Bell Springs is a member of the Nugget Sandstone in Wyoming and a formation in Utah.^[1] It is a Late Triassic (Norian to Rhaetian)^[2] Fossil theropod tracks assigned to Agialopous wyomingensis have been reported from the formation.^[3]^[4]

The formation composed of very fine grained limy sandstone that is distinguished from upper part of Nugget by presence of red to purple-red shale and lime cemented siltstone in beds less than 0.1 ft thick and by presence of calcareous firmly indurated beds 1–4 ft thick that are ripple laminated and weather to square faced ledges. May correlate with upper part of Chinle Formation.^[5]

References

^ "National Geologic Map Database". Retrieved January 22, 2023.
^ Bell Springs Formation at Fossilworks.org
^ Weishampel et al., 2004, pp.517-607
^ Branson & Mehl, 1932
^ Pipiringos, G.N., 1968, Correlation and nomenclature of some Triassic and Jurassic rocks in south-central Wyoming, IN Shorter contributions to general geology, 1967: U.S. Geological Survey Professional Paper, 594-D, p. D1-D26.

Bibliography

Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21
Branson, E. B.; Mehl, M. G. (1932), "Footprint records from Cretaceous, Triassic, and Pennsylvanian", Bulletin of the Geological Society of America, 42: 284–285