North Horn Formation

Edit links
Coordinates: 39°00′N 111°00′W / 39.0°N 111.0°W / 39.0; -111.0
Source: Wikipedia, the free encyclopedia.
North Horn Formation
Ma
Approximate paleocoordinates
46°48′N 88°00′W / 46.8°N 88.0°W / 46.8; -88.0
RegionUtah
Country United States
Extent~140 km (87 mi)
Type section
Named forNorth Horn Mountain
North Horn Formation is located in the United States
North Horn Formation
North Horn Formation (the United States)
North Horn Formation is located in Utah
North Horn Formation
North Horn Formation on the west face of North Horn Mountain, Emery County, Utah.

The North Horn Formation is a widespread non-marine sedimentary unit with extensive outcrops exposed in central and eastern Utah. The formation locally exceeds 3,600 feet (1,100 m) in thickness and is characterized by

palynomorphs.[6][7][8][9]

Stratigraphy

Type locality for the North Horn Formation on North Horn Mountain, Emery County, Utah

The North Horn Formation is a non-marine, stratigraphic unit located in east and central Utah which unconformably overlies the Late Cretaceous

Price Canyon, Utah, the basal contact for the North Horn Formation is Maastrichtian (latest Cretaceous) in age,[1][2][3] whereas its base is Paleocene in age on the eastern side of the swell.[2] Some of the most complete sections of the North Horn Formation are exposed west of the San Rafael Swell at North Horn Mountain in which the local stratigraphy sometimes exceeds 3,600 ft (1,100 m) in thickness. Further to the east, towards Green River, Utah, stratigraphic sections are significantly thinner compared to sections in the west with thicknesses varying between as little as 50 to 130 ft (15 to 40 m).[2][4]

Subdivisions

The formation is divided into three informal units based on broad but distinct

redbed
unit, which is nearly a 390 ft (120 m) thick and is composed of red brown mottled siltstone and sandy siltstone.

Paleontology

Characteristic dinosaur taxa include the ceratopsian

palynomorphs.[4][7][8][15] Marsupial remains similar to Alphadon and Eodelphis have also been found here as well.[16]

University of Colorado at Denver.[17] Bird and dinosaur eggs have also been found at the site, along with unidentified hadrosaur fossils (possibly from Edmontosaurus or Kritosaurus).[18]

Fossil content

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.
Vertebrates of the North Horn Formation
Genus Species Location Stratigraphic position Abundance Notes Image
Adocus[19] A. sp[20] Adocus
Alamosaurus[21] A. sanjuanensis[21] Alamosaurus
Basilemys[22] B. sp[23] Basilemys
Champsosaurus[24] C. sp[25] Champsosaurus
Lepisosteus[26] L. sp.[27] Lepisosteus
Polyglyphanodon[28] P. sternbergi[29] Polyglyphanodon
Pteraichnus[17]   Found at an unnamed site.[17]     Specimens kept at the Dinosaur Tracks Museum, of the University of Colorado at Denver.[17]  
Torosaurus[21] T. utahensis[21] Torosaurus
Tyrannosaurus[30][21] T. rex [31][21] Tyrannosaurus

See also

References

  1. ^ a b c d Fouch, T. D., Lawton, T. F., Nichols, D. J., Cashion, W. B., Cobban, W. A. (1983). Patterns and timing of synorogenic sedimentation in Upper Cretaceous rocks of central and northeast Utah. In Reynolds, M. W., and Dolly, E. D., eds., Mesozoic paleogeography of west central United States. Society of Economic Paleontologists and Mineralogists. Pp. 305-336.
  2. ^ a b c d e f g Lawton, T. F. (1986). Fluvial systems of the Upper Cretaceous Mesaverde Group and Paleocene North Horn Formation, central Utah: A record of transition from thin-skinned to thick-skinned deformation in the foreland region. Paleotectonics and Sedimentatio in the Rocky Mountain Region, United States. AAPG Special Volumes, M 41. Pp. 423-442.
  3. ^ a b c d Lawton, T. F., Talling, P. J., Hobbs, R. S., Trexler, J. H. Jr, Weiss, M. P., Burbank, D. W. (1993). Structure and stratigraphy of Upper Cretaceous and Paleocene strata (North Horn Formation), eastern San Pitch Mountains, Utah – sedimentation at the front of the Sevier orogenic belt. United States Geological Survey, Bulletin 1787-II, Pp. 1-33.
  4. ^ a b c d Difley, R., Ekdale, A. A. (2002). Faunal implications of an environmental change before the Cretaceous-Tertiary (K-T) transition in central Utah. Cretaceous Research, 23:315-331.
  5. ^ Myung-Suk, Y., Cross, A.T. (1997). Palynostratigraphy of Upper Cretaceous-Lower Tertiary strata, Price Canyon, Utah. Review of Palaeobotany and Palynology 97, p.53-66
  6. ^ a b Gilmore, C.W. (1946). Reptilian fauna of the North Horn Formation of central Utah. United States Geological Survey Professional Paper, 210-C, 53 p
  7. ^ a b Cifelli, R.L., Czaplewski, N.J., Rose, K.D. (1995). Knowledge of Paleocene Mammals from the North Horn Formation, Central Utah. The Great Basin Naturalist. Vol. 55:4. Pp. 304-314
  8. ^ a b Cifelli, R.L., Nydam, R.L., Eaton, J.G., Gardner, J.D., Kirkland, J.I. (1999). Vertebrate Faunas of the North Horn Formation (Upper Cretaceous-Lower Paleocene), Emery and Sanpete Counties, Utah. In Gillette, D.D. (ed.) Vertebrate Paleontology in Utah. Utah Geological Survey Miscellaneous Publication 99-1: 377-388
  9. S2CID 130309439
    . Retrieved 18 October 2020.
  10. ^ Spieker, E. M. (1946). Late Mesozoic and early Cenozoic history of central Utah. United States Geological Survey. Professional Paper 205-D, 117-159
  11. S2CID 131583311
    . Retrieved 13 April 2012.
  12. ^ Black, Riley. "Tyrannosaurus vs. Alamosaurus". Smithsonian Magazine. Smithsonian Institution. Retrieved 23 March 2009.
  13. S2CID 131583311
    . Retrieved 18 October 2020.
  14. ^ Sampson, S.D., Loewen, M.A.(2005). Tyrannosaurus from the Upper Cretaceous (Maastrichtian) North Horn Formation of Utah: biogeographic and paleoecologic implications. Journal of Vertebrate Paleontology 25:2, 469-472
  15. S2CID 128849169
    .
  16. S2CID 130086187
    . Retrieved 19 November 2020.
  17. ^
    ISSN 1612-4138
    .
  18. S2CID 128849169
    .
  19. ^ Gilmore, Charles W. (1946). "Reptilian fauna of the North Horn Formation of central Utah". US Government Printing Office. 210: 48. Retrieved 24 October 2020.
  20. ^ Gilmore, Charles W. (1946). "Reptilian fauna of the North Horn Formation of central Utah". US Government Printing Office. 210: 48. Retrieved 24 October 2020.
  21. ^
    ISBN 0-520-24209-2
    .
  22. ^ Gilmore, Charles W. (1946). "Reptilian fauna of the North Horn Formation of central Utah". US Government Printing Office. 210: 48. Retrieved 24 October 2020.
  23. ^ Gilmore, Charles W. (1946). "Reptilian fauna of the North Horn Formation of central Utah". US Government Printing Office. 210: 48. Retrieved 24 October 2020.
  24. ^ Gilmore, Charles W. (1946). "Reptilian fauna of the North Horn Formation of central Utah". US Government Printing Office. 210: 48. Retrieved 24 October 2020.
  25. ^ Gilmore, Charles W. (1946). "Reptilian fauna of the North Horn Formation of central Utah". US Government Printing Office. 210: 48. Retrieved 24 October 2020.
  26. ^ Gilmore, Charles W. (1946). "Reptilian fauna of the North Horn Formation of central Utah". US Government Printing Office. 210: 52. Retrieved 24 October 2020.
  27. ^ Gilmore, Charles W. (1946). "Reptilian fauna of the North Horn Formation of central Utah". US Government Printing Office. 210: 52. Retrieved 24 October 2020.
  28. ^ Gilmore, Charles W. (1946). "Reptilian fauna of the North Horn Formation of central Utah". US Government Printing Office. 210: 51. Retrieved 24 October 2020.
  29. ^ Gilmore, Charles W. (1946). "Reptilian fauna of the North Horn Formation of central Utah". US Government Printing Office. 210: 48. Retrieved 24 October 2020.
  30. S2CID 131583311
    . Retrieved 18 October 2020.
  31. S2CID 131583311
    . Retrieved 18 October 2020.
Retrieved from "https://en.wikipedia.org/w/index.php?title=North_Horn_Formation&oldid=1192029722"