Kaiparowits Formation

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Kaiparowits Formation
Stratigraphic range:
Upper Cretaceous,[1] 76.1–74 Ma
↓
[2]
Type Geological formation
Thickness 790 m (2,600 ft)
Lithology
Primary mudstone, sandstone
Location
Coordinates Lua error in package.lua at line 80: module 'strict' not found.
Region  Utah
Country  USA

The Kaiparowits Formation is a sedimentary rock formation found in the Kaiparowits Plateau in Grand Staircase-Escalante National Monument, in the southern part of Utah in the western United States. It is over 2800 feet (850 m) thick, and is Campanian in age. This Upper Cretaceous formation was formed from alluvial floodplains of large rivers in coastal southern Laramidia; sandstone beds are the deposit of rivers, and mudstone beds represent floodplain deposits. It is fossiliferous, with most specimens from the lower half of the formation, but exploration is only comparatively recent, with most work being done since 1982. It has been estimated that less than 10% of the Kaiparowits formation has been explored for fossils. Most fieldwork has been conducted by The Natural History Museum of Utah.

Habitat

The Kaiparowits Formation is a muddy bed that was deposited between about 76.1 to 74.0 million years ago,[2] in the area where the Grand Staircase-Escalante National Monument of Utah is today. It is extremely fossil rich, with thousands of plants and animal fossils being preserved in amongst its sand- and mud-stone deposits. Based on plants remains including multiple vines, leaves, and branches, It was assumed by paleontologists Scott Sampson and his colleagues that Utah in the Campanian was a dense jungle bordering the Western Interior Seaway. The jungle theory would also support why almost all the animals in the Kaiparowits Formation were new species, and why the deposits were so plentiful. Without the need for herbivores to migrate to find food, and theropods to migrate after herbivores, a whole ecosystem could evolve secluded from interbreeding. The theory also supported why the dinosaurs adorned such features like the 15 horns of Kosmoceratops, they were for sexual selection.[1]

Paleofauna

File:Kosmoceratops and Talos by durbed.jpg
A Kosmoceratops disturbed from its rest by a wandering Talos in Laramidia

Animals present include chondrichthyans (sharks and rays), gars, bowfin, sturgeons, frogs, salamanders, turtles, lizards, crocodilians (including Deinosuchus),[3] coelurosaurian theropods such as dromaeosaurids, troodontids, and Ornithomimus velox, armored dinosaurs, the duckbill Parasaurolophus cyrtocristatus, and a variety of early mammals including multituberculates, marsupials, and insectivorans.[4] Recent finds include large specimens of the duckbill Gryposaurus,[5] including the new species G. monumentensis,[5] and the first described remains of the oviraptorosaurian Hagryphus giganteus.[6]

Trace fossils are also known from the Kaiparowits, including an excellently preserved hadrosaur skin impression known from a recent analysis by Herrero and Farke.[7]

Turtles

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.
Turtles reported from the Kaiparowits Formation
Genus Species Location Stratigraphic position Material Notes Images

Boremys[8]

B. grandis[8]

A baenid

Arvinachelys[9]

A. goldeni

A baenid, notable for its atypical nasal structure.

Denazinemys[9]

D. nodosoa

middle unit of the upper Kaiparowits Formation

A baenid

Neurankylus[9]

Two species[9]

A baenid

Thescelus[9]

int.[9]

A baenid

Compsemys[10]

C. victa [10]

A dermatemydid

Compsemys[10]

C. victa[10]

A dermatemydid

Adocus[8]

indet., possibly several species[8]

A adocid

Basilemys[10]

B. nobilis[10]

A possible member of Nanhsiungchelyidae. By far the largest native turtle at about 78 centimeters in length.

Helopanoplia[8]

indt.[8]

A softshell turtle

Ornithischians

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.
Ornithischians reported from the Kaiparowits Formation
Genus Species Location Stratigraphic position Material Notes Images

Gryposaurus[11]

G. monumentensis[11]

A kritosaurin saurolophine hadrosaur
Parasaurolophus cyrtocristatus
File:Kaiparowits ornithopod.png
Undescribed ornithopod

Kosmoceratops[12]

K. richardsoni

A chasmosaurine ceratopsid

Nasutoceratops[13]

N. titusi

middle unit of the upper Kaiparowits Formation

A centrosaurine ceratopsid

Parasaurolophus[14]

P. cyrtocristatus[14]

A parasaurolophin lambeosaurine hadrosaur

Utahceratops[12]

U. gettyi

A chasmosaurine ceratopsid

Theropods

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.
Theropods reported from the Kaiparowits Formation
Genus Species Location Stratigraphic position Material Notes Images

Avisaurus[14]

Unnamed[14]

An avisaurid enantiornithine
Teratophoneus curriei

Hagryphus[11]

H. giganteus[11]

A caenagnathine caenagnathid

Ornithomimus?[14][15]

O. velox[14][15]

Probably not referable to Ornithomimus.[15]

Paronychodon[16]

Indeterminate[16]

Ricardoestesia[17]

Indeterminate[17]

Talos[11]

T. sampsoni[11]

A troodont

Teratophoneus[18]

T. curriei

A tyrannosaurine tyrannosaurid

Troodon[14]

Indeterminate[14]

See also

Footnotes

  1. ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 Joshua R. Lively (2015). "A new species of baenid turtle from the Kaiparowits Formation (Upper Cretaceous, Campanian) of southern Utah". Journal of Vertebrate Paleontology. Online edition. doi:10.1080/02724634.2015.1009084.
  10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ 11.0 11.1 11.2 11.3 11.4 11.5 Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ 12.0 12.1 Lua error in package.lua at line 80: module 'strict' not found.
  13. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  14. ↑ 14.0 14.1 14.2 14.3 14.4 14.5 14.6 14.7 "3.1 Utah, United States; 12. Kaiparowits Formation," in Weishampel, et al. (2004). Pages 579-580.
  15. ↑ 15.0 15.1 15.2 Zanno, L.E., Weirsma, J.P., Loewen, M.A., Sampson, S.D. and Getty, M.A. (2010). A preliminary report on the theropod dinosaur fauna of the late Campanian Kaiparowits Formation, Grand Staircase-Escalante National Monument, Utah." Learning from the Land Symposium: Geology and Paleontology. Washington, DC: Bureau of Land Management.
  16. ↑ 16.0 16.1 Listed as "cf. Paronychodon sp." in "3.1 Utah, United States; 12. Kaiparowits Formation," in Weishampel, et al. (2004). Page 579.
  17. ↑ 17.0 17.1 Listed as "cf. Ricardoestesia sp." in "3.1 Utah, United States; 12. Kaiparowits Formation," in Weishampel, et al. (2004). Page 579.
  18. ↑ Lua error in package.lua at line 80: module 'strict' not found.

References

  • Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.

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