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
editAll paleofauna listed are taken from a list compiled by Bonde (2008a)[3] unless stated otherwise.
Non-dinosaurs
edit- cf. Adocus
- Baena sp.
- Ceratodus sp.
- Coprolites (indet.)
- Crocodyliformes indet.
- Gastropoda indet.
- Holostei indet.
- Lepisosteidae indet.
- Naomichelys sp.
- Scoyenia sp.
- Trionychidae (?) indet.
Dinosaurs
edit- Dromaeosauridae indet.
- Iguanodontia indet.
- Macroelongatoolithus carlylei[1]
- Nevadadromeus schmitti[7]
- Ornithopoda indet.[8]
- Theropoda indet.
- Titanosauriformes indet.
- Thyreophora indet.
- Tyrannosauroidea indet.
References
edit- ^ a b Bonde, Joshua W.; Varricchio, David J.; Jackson, Frankie D.; Loope, David B.; Shirk, Aubrey M. (2008b), "Dinosaurs and dunes! Sedimentology and paleontology of the Mesozoic in the Valley of Fire State Park", GSA Field Guide 11: Field Guide to Plutons, Volcanoes, Faults, Reefs, Dinosaurs, and Possible Glaciation in Selected Areas of Arizona, California, and Nevada, vol. 11, Geological Society of America, pp. 249–262, doi:10.1130/2008.fld011(11), ISBN 978-0-8137-0011-3, retrieved October 22, 2022
- ^ Longwell, C.R. (1949). "Structure of the Northern Muddy Mountain Area, Nevada". Geological Society of America Bulletin. 60 (5): 923–968. Bibcode:1949GSAB...60..923L. doi:10.1130/0016-7606(1949)60[923:SOTNMM]2.0.CO;2. ISSN 0016-7606. Wikidata Q60182382.
- ^ a b c William., Bonde, Joshua (2008a). Paleoecology and taphonomy of the Willow Tank Formation (Albian), Southern Nevada. OCLC 302295902.
{{cite book}}: CS1 maint: multiple names: authors list (link) - ^ "Lake Mead G-E-M resources area (GRA no. NV-35) : Technical report (WSAs NV 050-0231, 050–0233, 050–0235, 050–0236, and 050-0238) : Final report" (PDF).
- ^ "Nellis/Quail Spring G-E-M resources area (GRA no. NV-33) : Technical report (WSAs NV 050-0411, 050-04R-15A, B, and C) : Final report" (PDF).
- ^ "Muddy Mountains G-E-M resources area (GRA no. NV-34) : Technical report (WSA NV 050-0229) : Final report" (PDF).
- ^ a b Bonde, Joshua W.; Hall, Rebecca L.; Krumenacker, L. J.; Varricchio, David J. (2022). "Nevadadromeus schmitti (gen. et sp. nov.), a New Basal Neornithischian with Affinities to the Thescelosaurinae, from the Upper Cretaceous (Cenomanian) Willow Tank Formation of Southern Nevada". Journal of the Arizona-Nevada Academy of Science. 50 (1): 1–8. doi:10.2181/036.050.0101. ISSN 0193-8509. S2CID 252931645.
- ^ Humphrey, Rebecca (2017). "Late Cretaceous Ornithopod Dinosaur Fossil Assmblege from the Willow Tank Formation of Southeastern Nevada". Geological Society of America Abstracts with Programs. Geological Society of America. doi:10.1130/abs/2017cd-293081.
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