Geologic Formation in the United States
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).
Fossil theropod tracks have been reported from the formation.
Fossil content.
Intermediate theropod, sphenosuchian, drepanosaurid and sphenodontian remains are known.
References.
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