Nugget Sandstone
Stratigraphic range: Norian-Toarcian ~220–180 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Salmon-pink and white sandstones of the upper part of the Nugget Formation, Wind River Mountains, Wyoming
Type	Geological formation
Unit of	Glen Canyon Group
Underlies	Carmel Formation
Overlies	Chinle Formation
Thickness	200 m (660 ft)
Lithology
Primary	Sandstone
Other	Mudstone, siltstone
Location
Coordinates	40°24′N 109°18′W / 40.4°N 109.3°W / 40.4; -109.3
Approximate paleocoordinates	27°24′N 46°36′W / 27.4°N 46.6°W / 27.4; -46.6
Region	Colorado, Idaho, Utah
Country	United States
Extent	Colorado Plateau
Nugget Sandstone (the United States) Show map of the United States Nugget Sandstone (Utah) Show map of Utah

The Nugget Sandstone is a Late Triassic to Early Jurassic geologic formation that outcrops in Colorado, Idaho, Wyoming, and Utah, western United States.

In Wyoming, it is composed of a lower hematite-stained siltstone and thin-bedded sandstone. The upper part is a salmon-pink and light-gray, fine- to medium-grained cliff-forming sandstone that exhibits massive bedding to large scale cross-beds of dunes. Thickness ranges up to 86.9 m (285 feet).^[1]

Fossil theropod tracks have been reported from the formation.^[2]

Intermediate theropod, sphenosuchian, drepanosaurid and sphenodontian remains are known.^[3]

Other fossils

• Rhynchosauroides sp.
• Lepidosauria indet.

• Batrachopus sp.
• Brachychirotherium sp.
• Brasilichnium sp.
• Cochlichnus sp.
• Diplichnites sp.
• Grallator (Eubrontes)
• Gwyneddichnium sp.
• Octopodichnus sp.
• Otozoum sp.
• cf. Paleohelcura sp.
• Pterichnus sp.
• Scoyenia sp.
• Treptichnus sp.
• ?Acanthichnus sp.
• ?Apatopus sp.

• List of pterosaur-bearing stratigraphic units
• List of dinosaur-bearing rock formations
  • List of stratigraphic units with theropod tracks

• Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2

• Lockley, M. G.; Tedrow, A. R.; Chamberlain, K. C.; Minter, N. J.; Lim, J.-D. (2011). Sullivan, R. M.; Lucas, S. G.; Spielmann, J. A. (eds.). "Footprints and invertebrate traces from a new site in the Nugget Sandstone (Lower Jurassic) of Idaho: implications for life in the northern reaches of the great Navajo-Nugget erg system in the western USA". Fossil Record 3. New Mexico Museum of Natural History and Science Bulletin. 53: 344–356.
• Lockley, M. G. (2011). Sullivan, R. M.; Lucas, S. G.; Spielmann, J. A. (eds.). "Theropod- and prosauropod-dominated ichnofaunas from the Navajo-Nugget Sandstone (Lower Jurassic) at Dinosaur National Monument: implications for prosauropod behaviour and ecology". Fossil Record 3. New Mexico Museum of Natural History and Science Bulletin. 53: 316–320.
• Lockley, M. G. (1986). "A Guide to Dinosaur Tracksites of the Colorado Plateau and American Southwest". University of Colorado at Denver Geology Department Magazine. Special Issue 1: 1–56.