Willow_Tank_Formation
Willow Tank Formation
Geologic formation in North America
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]
Quick Facts Type, Underlies ...
Willow Tank Formation | |
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Stratigraphic range: Late Cretaceous, Cenomanian | |
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 |
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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.
- 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.
- 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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