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Nugget Sandstone
Geologic Formation in the United States / From Wikipedia, the free encyclopedia
The Nugget Sandstone is a Late Triassic to Early Jurassic geologic formation that outcrops in Colorado, Idaho, Wyoming, and Utah, western United States.
Quick Facts Type, Unit of ...
Nugget Sandstone | |
---|---|
Stratigraphic range: Norian-Toarcian ~220–180 Ma | |
![]() 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 / 40.4; -109.3 |
Approximate paleocoordinates | 27.4°N 46.6°W / 27.4; -46.6 |
Region | Colorado, Idaho, Utah |
Country | ![]() |
Extent | Colorado Plateau |
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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]