Nugget Sandstone

Short description: Geologic Formation in the United States

Nugget Sandstone
Stratigraphic range: Norian-Toarcian
~220–180 Ma

PreЄ

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
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)

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Nugget Sandstone (Utah)

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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.

Eubrontes track in the Nugget Sandstone, Red Fleet State Park, Uintah County, 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]

## Contents

* 1 Fossil content
* 1.1 Ichnofossils
* 2 See also
* 3 References
* 3.1 Bibliography
* 4 Further reading

## 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

* 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.

## See also

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

## References

1. ↑ 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.
2. ↑ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
3. ↑ 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
4. ↑ 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.

### 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). "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. https://econtent.unm.edu/digital/collection/bulletins/id/1425/rec/2.
* Lockley, M. G. (2011). "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. https://econtent.unm.edu/digital/collection/bulletins/id/1421/rec/2.
* 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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