Nugget Sandstone
{{Short description|Geologic Formation in the United States}}
{{Infobox rockunit
| name = Nugget Sandstone
| image =Nuggest SS Wyo.jpg
| caption =Salmon-pink and white sandstones of the upper part of the Nugget Formation, Wind River Mountains, Wyoming
| type = Geological formation
| age = Norian-Toarcian
~{{fossil range|220|180}}
| period = Early Jurassic
| prilithology = Sandstone
| otherlithology = Mudstone, siltstone
| namedfor =
| namedby =
| region = Colorado, Idaho, Utah
| country = {{US}}
| coordinates = {{coord|40.4|N|109.3|W|display=inline,title}}
| paleocoordinates = {{coord|27.4|N|46.6|W|display=inline}}
| unitof = Glen Canyon Group
| subunits =
| underlies = Carmel Formation
| overlies = Chinle Formation
| thickness = {{convert|200|m|ft|abbr=on}}
| extent = Colorado Plateau
| area =
| map = {{Location map+ | United States#Utah
| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | United States#Utah
| lat_deg = 40.4
| lon_deg = -109.3
| mark = Blue pog.svg
| marksize = 12
}}
}}
| map_caption =
}}
File:Nugget- Red Fleet Res 3.jpg
File:Nugget bounding surface-Red Fleet.jpg
File:Track site Red Fleet (2).jpg
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).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.
Fossil theropod tracks have been reported from the formation.Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
Fossil content
Intermediate theropod, sphenosuchian, drepanosaurid and sphenodontian remains are known.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
| class="wikitable" align="center" | ||||
| colspan="7" style="text-align:center;" | Paleofauna reported from the Nugget Sandstone | ||||
|---|---|---|---|---|
| Genus | Species | Material | Notes | Images |
| Caelestiventus{{cite journal |author1=Brooks B. Britt |author2=Fabio M. Dalla Vecchia |author3=Daniel J. Chure |author4=George F. Engelmann |author5=Michael F. Whiting |author6=Rodney D. Scheetz |year=2018 |title=Caelestiventus hanseni gen. et sp. nov. extends the desert-dwelling pterosaur record back 65 million years |journal=Nature Ecology & Evolution |volume=2 |issue=9 |pages=1386–1392 |doi=10.1038/s41559-018-0627-y |pmid=30104753 |bibcode=2018NatEE...2.1386B |s2cid=51984440 }}
| 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 =
See also
References
{{Reflist}}
= 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
- {{cite journal |first1=M. G. |last1=Lockley |first2=A. R. |last2=Tedrow |first3=K. C. |last3=Chamberlain |first4=N. J. |last4=Minter |first5=J.-D. |last5=Lim |year=2011 |title=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 |editor-first1=R. M. |editor-last1=Sullivan |editor-first2=S. G. |editor-last2=Lucas |editor-first3=J. A. |editor-last3=Spielmann |journal=Fossil Record 3. New Mexico Museum of Natural History and Science Bulletin |volume=53 |pages=344–356 |url=https://econtent.unm.edu/digital/collection/bulletins/id/1425/rec/2}}
- {{cite journal |first1=M. G. |last1=Lockley |year=2011 |title=Theropod- and prosauropod-dominated ichnofaunas from the Navajo-Nugget Sandstone (Lower Jurassic) at Dinosaur National Monument: implications for prosauropod behaviour and ecology |editor-first1=R. M. |editor-last1=Sullivan |editor-first2=S. G. |editor-last2=Lucas |editor-first3=J. A. |editor-last3=Spielmann |journal=Fossil Record 3. New Mexico Museum of Natural History and Science Bulletin |volume=53 |pages=316–320 |url=https://econtent.unm.edu/digital/collection/bulletins/id/1421/rec/2}}
- {{cite journal |first1=M. G. |last1=Lockley |year=1986 |title=A Guide to Dinosaur Tracksites of the Colorado Plateau and American Southwest |journal=University of Colorado at Denver Geology Department Magazine |volume=Special Issue 1 |pages=1–56}}
Category:Geologic formations of Colorado
Category:Geologic formations of Idaho
Category:Geologic formations of Utah
Category:Triassic System of North America
Category:Jurassic System of North America
Category:Sandstone formations of the United States
Category:Ichnofossiliferous formations
Category:Paleontology in Colorado