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.
| 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) | |
Nugget Sandstone near Red Fleet Reservoir, Uintah County, Utah. Uniform grain size and these large cross-stratification are indicative of an ancient sand dune.
Nugget Sandstone showing a bounding surface between two sets of ancient sand dunes, where wind scour eroded the top of the lower dune before the second dune advanced over it. Red Fleet Reservoir, Uintah County, Utah.
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Eubrontes track in the Nugget Sandstone, Red Fleet State Park, Uintah County, Utah.
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, the first known diagnostic pterosaur 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.
See also
References
- Johnson, J.F. and Sutherland, W.M., 2009, Geologic map of the Lander 30' x 60' quadrangle, Fremont County, Wyoming, Wyoming State Geological Survey, Map Series MS-87, 1:100,000.
- Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
- B. B. Britt, D. J. Chure, G. F. Engelmann and J. D. Shumway. 2016. Rise of the erg—paleontology and paleoenvironments of the Triassic-Jurassic transition in northeastern Utah. Geology of the Intermountain West 3:1-32
- Brooks B. Britt; Fabio M. Dalla Vecchia; Daniel J. Chure; George F. Engelmann; Michael F. Whiting; Rodney D. Scheetz (2018). "Caelestiventus hanseni gen. et sp. nov. extends the desert-dwelling pterosaur record back 65 million years". Nature Ecology & Evolution. 2 (9): 1386–1392. doi:10.1038/s41559-018-0627-y. PMID 30104753. S2CID 51984440.
Bibliography
- Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2
Further reading
- 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.
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