Willow Tank Formation

The Willow Tank Formation is a geologic formation which outcrops in the U.S. state of Nevada. Initially believed to be of Early Cretaceous (Albian) age,^[3] later studies have concluded that it was more likely to be of Late Cretaceous (Cenomanian) age,^[4][5][6][7] making it equivalent to the Cloverly and Cedar Mountain Formations. It was deposited in an anastomosed fluvial system.^[3]

Willow Tank Formation
Stratigraphic range: Late Cretaceous, Cenomanian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	Baseline Sandstone[1]
Overlies	Aztec Sandstone[2]
Thickness	unknown
Lithology
Primary	Claystone, conglomerate, sandstone
Location
Coordinates	36°27′22″N 114°31′59″W
Approximate paleocoordinates	20.8°N 53.4°W / 20.8; -53.4
Region	Nevada
Country	United States
Extent	Valley of Fire, Nevada

Paleofauna

All paleofauna listed are taken from a list compiled by Bonde (2008a)^[3] unless stated otherwise.

Non-dinosaurs

• cf. Adocus
• Baena sp.
• Ceratodus sp.
• Coprolites (indet.)
• Crocodyliformes indet.
• Gastropoda indet.
• Holostei indet.
• Lepisosteidae indet.
• Naomichelys sp.
• Scoyenia sp.
• Trionychidae (?) indet.

Dinosaurs

• Dromaeosauridae indet.
• Iguanodontia indet.
• Macroelongatoolithus carlylei^[1]
• Nevadadromeus schmitti^[7]
• Ornithopoda indet.^[8]
• Theropoda indet.
• Titanosauriformes indet.
• Thyreophora indet.
• Tyrannosauroidea indet.