Javelina Formation

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Template:Short description Script error: No such module "Infobox".Template:Template otherScript error: No such module "check for unknown parameters".

The Javelina Formation is a geological formation in Texas. Dating has shown that the strata date to the Maastrichtian stage of the Late Cretaceous, approximately 70 to 66.5 million years old.[1] The middle part of the formation has been dated to about 69 million years ago plus or minus 1 million years and the top situated near the Cretaceous–Paleogene boundary (in the overlying Black Peaks Formation[1]), dated to 66 Ma ago.[2] Dinosaur remains are among the fossils that have been recovered from the formation.[3]

Age

The typical age range of the Javelina Formation has been difficult to determine.[4] Only one geological site in the Javelina Formation has thus far yielded the correct rock types for radiometric dating. The outcrop, situated in the middle strata of the formation about 90 meters below the K-Pg boundary and within the local range of Alamosaurus fossils and below two sites that have yielded Quetzalcoatlus fossils, was dated to 69.0 plus or minus 0.9 million years old in 2010.[2] Indeterminate chasmosaurinae fossils have also been as well.[5]

Fossil content

Vertebrate paleofauna

Vertebrates of the Javelina Formation
Genus Species Location Stratigraphic position Material Notes Images
Alamosaurus A. sanjuanensis A titanosaurian sauropod, also from the Ojo Alamo Formation
File:Alamosaurus-sanjuanensis.jpg
Bravoceratops B. polyphemus A chasmosaurine ceratopsid known from the lowermost part of the Javelina Formation which dates back to the early Maastrichtian.[6]
File:Bravoceratops NT small.jpg
Dasyatis[7] Unknown A ray
File:Common stingray tynemouth.jpg
Gryposaurus?[8] G.? alsatei[8] A saurolophine hadrosaurid known from the Two Medicine Formation, the Dinosaur Park Formation, the Kaiparowits Formation, possible remains have also been unearthed in the El Picacho Formation.[9]
File:Gryposaurus? alstasei profile reconstruction.jpg
Kritosaurus[8][10][11][12] K. cf. navajovius[8][13][12][11] A saurolophine handrosaurid, also known from the Kirtland Formation, Aguja Formation, Ojo Alamo Formation and the El Picacho Formation. A possible second species of Kritosaurus might have lived in the Javelina Formation.[8][12] Fossils have also been unearthed in the Olmos Formation.[14]
File:Kritosaurus BW.jpg
Quetzalcoatlus Q. northropi and Q. lawsoni[15] An azhdarchid pterosaur
File:Life restoration of a group of giant azhdarchids, Quetzalcoatlus northropi, foraging on a Cretaceous fern prairie.png
Rhombodus[7] Unknown A ray
File:Rhombodus NT small.jpg
Saurornitholestes[16] S. cf. langstoni A dromaeosaurid
File:Saurornitholestes digging Burrows wahweap.jpg
Saurolophinae[8] Indeterminate[8] A saurolophine handrosaurid similar to the genus Saurolophus.
Torosaurus[17] T. cf. utahensis[17] A chasmosaurine ceratopsid whose remains have been found in the Frenchman Formation, Hell Creek Formation, North Horn Formation, McRae Formation, and Lance Formation.
File:"Torosaurus" utahensis profile reconstruction.jpg
Troodontidae Indeterminate[18] A troodontid
File:Troodon (cropped).jpg
cf. Tyrannosaurus Indeterminate[19] A tyrannosaurid, originally identified from the Hell Creek Formation. Also found in the Denver, Ferris, Frenchman, Lance, Livingston, North Horn, Scollard, and Willow Creek Formations.[20] File:Tyrannosaurus-rex-Profile-steveoc86.png
Trionychidae Indeterminate Indeterminate turtle remains
Wellnhopterus[15] W. brevirostris An azhdarchid pterosaur.

Flora

Woody dicots and angiosperms have been unearthed in this formation.[21][22] Plant fossils indicate that this area was a woodland habitat.[23]

Flora of the Javelina Formation
Genus Species Location Stratigraphic position Material Notes Images
Javelinoxylon[24] J. multiporosum[25] A dicotyledonous tree

See also

<templatestyles src="Div col/styles.css"/>

Script error: No such module "Check for unknown parameters".

References

<templatestyles src="Reflist/styles.css" />

  1. ↑ a b Woodward, H. N. (2005). Bone histology of the sauropod dinosaur Alamosaurus sanjuanensis from the Javelina Formation, Big Bend National Park, Texas.
  2. ↑ a b Script error: No such module "Citation/CS1".
  3. ↑ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. Template:ISBN.
  4. ↑ Script error: No such module "Citation/CS1".Script error: No such module "Unsubst".
  5. ↑ Script error: No such module "Citation/CS1".
  6. ↑ Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ a b c d e f g Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Template:Cite thesis
  11. ↑ a b Script error: No such module "Citation/CS1".
  12. ↑ a b c Script error: No such module "Citation/CS1".
  13. ↑ Template:Cite thesis
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ a b Script error: No such module "Citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ a b Script error: No such module "Citation/CS1".
  18. ↑ Script error: No such module "Citation/CS1".
  19. ↑ Script error: No such module "Citation/CS1".
  20. ↑ Script error: No such module "Citation/CS1".
  21. ↑ Script error: No such module "Citation/CS1".
  22. ↑ Script error: No such module "Citation/CS1".
  23. ↑ Script error: No such module "Citation/CS1".
  24. ↑ Jacobs, L. 1995. Lone Star Dinosaurs. Texas A&M University Press. p.102
  25. ↑ Script error: No such module "Citation/CS1".

Script error: No such module "Check for unknown parameters".

Further reading

  • S. L. Wick and T. M. Lehman. 2013. A new ceratopsian dinosaur from the Javelina Formation (Maastrichtian) of West Texas and implications for chasmosaurine phylogeny. Naturwissenschaften
  • T. M. Lehman and A. B. Coulson. 2002. A juvenile specimen of the sauropod dinosaur Alamosaurus sanjuanensis from the Upper Cretaceous of Big Bend National Park, Texas. Journal of Paleontology 76(1):156-172
  • A. R. Fiorillo. 1998. Preliminary report on a new sauropod locality in the Javelina Formation (Late Cretaceous), Big Bend National Park, Texas. In V. L. Santucci & L. McClelland (eds.), National Park Service Geologic Resources Division Technical Report NPS/NRGRD/GRDTR-98/01. National Park Service Paleontological Research Volume 3:29-31
  • A. W. A. Kellner and W. Langston. 1996. Cranial remains of Quetzalcoatlus (Pterosauria, Azhdarchidae) from Late Cretaceous sediments of Big Bend National Park, Texas. Journal of Vertebrate Paleontology 16(2):222-231
  • D. A. Lawson. 1976. Tyrannosaurus and Torosaurus, Maestrichtian dinosaurs from Trans-Pecos, Texas. Journal of Paleontology 50(1):158-164
  • D. A. Lawson. 1975. Pterosaur from the latest Cretaceous of West Texas: discovery of the largest flying creature. Science 187:947-948
Retrieved from "http://debianws.lexgopc.com/wiki143/index.php?title=Javelina_Formation&oldid=7719264"