Nugget Sandstone
Geologic Formation in the United States
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The Nugget Sandstone is a Late Triassic to Early Jurassic geologic formation that outcrops in Colorado, Idaho, Wyoming, and Utah, western United States.
| Nugget Sandstone | |
|---|---|
| Stratigraphic range: Norian-Toarcian ~ | |
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 | 40.4°N 109.3°W |
| Approximate paleocoordinates | 27.4°N 46.6°W |
| Region | Colorado, Idaho, Utah |
| Country | United States |
| Extent | Colorado Plateau |
  Nugget Sandstone (the United States)  Nugget Sandstone (Utah) | |
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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]
Fossil content
Intermediate theropod, sphenosuchian, drepanosaurid and sphenodontian remains are known.[3]
| Paleofauna reported from the Nugget Sandstone | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Material | Notes | Images | ||
| Caelestiventus[4] | C. hanseni | Most of the skull, a complete lower jaw, a finger bone | A dimorphodontid pterosaur; one of the earliest known diagnostic pterosaurs in North America. | |||
- Other fossils
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.