The Bell Springs is a member of the Nugget Sandstone in Wyoming and a formation in Utah. It is a Late Triassic (Norian to Rhaetian)Bell Springs Formation at Fossilworks.org Fossil theropod tracks assigned to Agialopous wyomingensis have been reported from the formation.Weishampel et al., 2004, pp.517-607Branson & Mehl, 1932
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.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.
See also List of dinosaur-bearing rock formations List of stratigraphic units with theropod tracks
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