Nugget Sandstone facts for kids

Quick facts for kids Nugget Sandstone Stratigraphic range: Norian-Toarcian ~220–180Ma PreЄ Є O S D C P T J K Pg N
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
Approximate 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 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 and Utah, western United States. Fossil theropod tracks have been reported from the formation.

Fossil content

Intermediate theropod, sphenosuchian, drepanosaurid and sphenodontian remains are known.

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.