Earth:Willow Tank Formation

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Willow Tank Formation
Stratigraphic range: Late Cretaceous, Cenomanian
TypeGeological formation
UnderliesBaseline Sandstone
OverliesAztec Sandstone[1]
Thicknessunknown
Lithology
PrimaryClaystone, conglomerate, sandstone
Location
Coordinates [ ⚑ ] : 36°27′22″N 114°31′59″W / 36.45611°N 114.53306°W / 36.45611; -114.53306
Paleocoordinates [ ⚑ ] 20°48′N 53°24′W / 20.8°N 53.4°W / 20.8; -53.4
RegionNevada
CountryUnited States
ExtentValley of Fire, Nevada

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,[2] later studies have concluded that it was more likely to be of Late Cretaceous (Cenomanian) age,[3][4][5] making it equivalent to the Wayan Formation and the Mussentuchit Member of the Cedar Mountain Formation. It was deposited in an anastomosed fluvial system.[2]

Fossil records

The list is primarily based on Bonde (2008)[2] and Bonde et al. (2008)[6], unless stated otherwise.

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Plants

Plants of the Willow Tank Formation
Genus Species Presence Materials Notes Images
Cladophlebis C. sp.
Matonia M. sp.

Gastropods

Gastropods of the Willow Tank Formation
Genus Species Presence Materials Notes Images
Gastropoda indeterminate Single shell

Fish

Fishes of the Willow Tank Formation
Genus Species Presence Materials Notes Images
Ceratodus C. sp. Teeth plates
Lepisosteidae indeterminate Ganoid scales, rectangular to rhoombohedral in shape
Holostean indeterminate Ganoid scales, polygonal in shape

Testudines

Turtles of the Willow Tank Formation
Genus Species Presence Materials Notes Images
Naomichelys N. speciosa Carapace and plastron elements
Baenidae indeterminate Shell elements and a pelvic girdle
cf. Adocus cf. A. sp. Several shell specimens
?Trionychidae indeterminate Fragmentary specimens

Crocodylomorphs

Crocodylomorphs of the Willow Tank Formation
Genus Species Presence Materials Notes Images
Crocodylomorpha indeterminate Dental elements and scutes

Dinosaurs

Dinosaurs of the Willow Tank Formation
Genus Species Presence Materials Notes Images
Theropoda indeterminate Dental elements, and two different eggshell morphotypes One of the eggshell morphotype shows similarities with Macroelongatoolithus carylei
Tyrannosauroidea indeterminate Dental elements
Dromaeosauridae indeterminate Femur, tibia and teeth
Titanosauriformes indeterminate Single tooth
Nevadadromeus[7] N. schmitti Partial skeleton
Iguanodontia indeterminate Teeth and partial skeleton Includes Iguanodon-grade taxa and hadrosaur-grade taxa according to Bonde (2008).
Thyreophora indeterminate Dental remains

References

  1. ↑ Longwell, C.R. , Wikidata Q60182382
  2. ↑ 2.0 2.1 2.2 Bonde, Joshua (19 December 2008). PALEOECOLOGY AND TAPHONOMY OF THE WILLOW TANK FORMATION (ALBIAN), SOUTHERN NEVADA (Unpublished Master's thesis). Montana State University. https://www.researchgate.net/publication/267851715_PALEOECOLOGY_AND_TAPHONOMY_OF_THE_WILLOW_TANK_FORMATION_ALBIAN_SOUTHERN_NEVADA. 
  3. ↑ "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". https://commons.wikimedia.org/wiki/File: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_(IA_lakemeadgemresou00grea).pdf. 
  4. ↑ "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". https://commons.wikimedia.org/wiki/File: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_(IA_nellisquailsprin00grea).pdf. 
  5. ↑ "Muddy Mountains G-E-M resources area (GRA no. NV-34) : Technical report (WSA NV 050-0229) : Final report". https://commons.wikimedia.org/wiki/File:Muddy_Mountains_G-E-M_resources_area_(GRA_no._NV-34)_-_technical_report_(WSA_NV_050-0229)_-_final_report_(IA_muddymountainsge00grea).pdf. 
  6. ↑ Bonde, Joshua W.; Varricchio, David J.; Jackson, Frankie D.; Loope, David B.; Shirk, Aubrey M. (2008). "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 11: 249–262. doi:10.1130/2008.fld011(11). https://www.researchgate.net/publication/275524211_Dinosaurs_and_dunes_Sedimentology_and_paleontology_of_the_Mesozoic_in_the_Valley_of_Fire_State_Park. Retrieved 1 October 2026. 
  7. ↑ Bonde, Joshua W.; Hall, Rebecca L.; Krumenacker, L. J.; Varricchio, David J. (14 October 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). doi:10.2181/036.050.0101. 

Template:Chronostratigraphy of Nevada



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