Nugget Sandstone

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.


 * Other fossils
 * Rhynchosauroides sp.
 * Lepidosauria indet.

Ichnofossils

 * 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.