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, | |
| 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 / 36.45611°N 114.53306°W |
| Approximate paleocoordinates | 20°48′N 53°24′W / 20.8°N 53.4°W |
| 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.