Английская Википедия:Cañadón Calcáreo Formation

Материал из Онлайн справочника
Перейти к навигацииПерейти к поиску

Шаблон:Infobox rockunit

The Cañadón Calcáreo Formation is an Oxfordian to Kimmeridgian-aged geologic formation, from the Cañadón Asfalto Basin in Chubut Province, Argentina, a rift basin that started forming since the earliest Jurassic.[1] It was formerly thought to date into the Cretaceous, but the age has been revised with Uranium–lead dating as likely being solely Late Jurassic in age.[2][3][4]

It is a subunit of the Sierra de Olte Group, close to the city Cerro Condor in the Chubut Province of northwestern Patagonia, in southern Argentina. The formation is composed primarily of fluvial sandstones alongside shales and volcanic tuffites[3]

The formation preserves fishes, crocodylomorphs and some dinosaur taxa, as well as conifers.

Geology

The Cañadón Calcáreo Formation is composed mainly of fluvial deposits, that are found close to the Cañadón Asfalto Formation. While originally thought to be part of the Cañadón Asfalto, there is a lack of calcareous rocks, and the geologic faulting and folding is weaker. The Cañadón Calcáreo Formation is overlain by the Chubut Group, the rocks of which lack synsedimentary deformation. The area of the Cañadón Calcáreo also includes lacustrine and palustrine rocks, including shales, pelites, psammites and coarse clastics.[4]

Age

The age of the Cañadón Calcáreo Formation was originally presumed to be Late Jurassic, probably Kimmeridgian to Tithonian in age.[3] However, it has also been suggested to span the entire Late Jurassic, beginning in the Oxfordian, although this could also be because of the uncertainty of the youngest age Cañadón Asfalto Formation.[3][5] A 2009 study of the palynology from a section of the formation revealed an age that was Hauterivian, which suggests that the formation extends from the Late Jurassic into the Early Cretaceous.[4]

Paleobiota

Dinosaurs of the Cañadón Calcáreo Formation
Taxon Material Notes Image
Ornithischians
Stegosauria indet. Humerus[6]
Sauropods
Brachytrachelopan mesai Partial articulated skeleton including a nearly complete presacral column[3] A dicraeosaurid with a remarkably short neck Файл:Brachytrachelopan group.jpg
Tehuelchesaurus benitezii Partial skeleton including skin impressions[3] A eusauropod of uncertain relationships Файл:Tehuelchesaurus benetezii.jpg
Diplodocidae indet. Three partial dorsal vertebrae[7]
Titanosauriformes indet. Humerus, chevron[8] Originally reported as a brachiosaurid[9]
Theropods
Pandoravenator fernandezorum Partial skeleton[5] Basal tetanuran close to the base of Averostra.[5]
Abelisauridae indet. Cervical vertebra, fragmentary skeleton[10]
Crocodylomorphs of the Cañadón Calcáreo Formation
Genus Species Location Stratigraphic position Material Notes Images
Almadasuchus[11] A. figarii[11] Patagonia Cerro Condor[11] Partial skull and postcranial skeleton.[11] A non-crocodyliform crocodylomorph. The type species is Almadasuchus figarii. Sediments alternatively referred by different authors to the Cañadón Calcáreo Formation or to the Puesto Almada Member of the Cañadón Asfalto Formation.[11]
Fishes of the Cañadón Calcáreo Formation
Genus Species Location Stratigraphic position Material Notes Images
Condorlepis[12] C. groeberi[12] Patagonia Cerro Condor[12] Almost complete skeleton.[12] A coccolepidid, a member of Chondrostei; a new genus for "Oligopleurus" groeberi Bordas (1943).[12]
Plants of the Cañadón Calcáreo Formation
Genus Species Location Stratigraphic position Material Notes Images
Pararaucaria[13] P. delfueyoi[13] Patagonia Chubut[13] Conifer seed cones.[13] A member of Coniferales belonging to the family Cheirolepidiaceae, a species of Pararaucaria.[13]

See also

References

Шаблон:Reflist

Bibliography

Further reading

Шаблон:Commons category

  • O. W. M. Rauhut, J. L. Carballido, and D. Pol. 2015. A diplodocid sauropod dinosaur from the Late Jurassic Cañadón Calcáreo Formation of Chubut, Argentina. Journal of Vertebrate Paleontology 35(5):e982798:1-8
  • O. W. M. Rauhut, K. Remes, R. Fechner, G. Cladera, and P. Puerta. 2005. Discovery of a short-necked sauropod dinosaur from the Late Jurassic period of Patagonia. Nature 435:670-672
  • T. H. Rich, O. Giménez, R. Cúneo, P. F. Puerta, R. Vacca and P. A. Vickers-Rich. 1997. Primer registro de un camarasáurido primitivo en el Gondwana patagónico [First record of a primitive camarasaurid in Patagonian Gondwana]. Ameghiniana 34(4):540

Шаблон:Portal bar

Партнерские ресурсы
Криптовалюты
Магазины
Хостинг
Разное

  1. ↑ Figari et al., 2015, p.142
  2. ↑ Шаблон:Cite journal
  3. ↑ 3,0 3,1 3,2 3,3 3,4 3,5 Шаблон:Cite book
  4. ↑ 4,0 4,1 4,2 Шаблон:Cite journal
  5. ↑ 5,0 5,1 5,2 Ошибка цитирования Неверный тег <ref>; для сносок Rauhut2017 не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Rauhut2021B не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Rauhut2015 не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Mannion2013 не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Rauhut2006 не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Rauhut2021A не указан текст
  11. ↑ 11,0 11,1 11,2 11,3 11,4 Шаблон:Cite journal
  12. ↑ 12,0 12,1 12,2 12,3 12,4 Шаблон:Cite journal
  13. ↑ 13,0 13,1 13,2 13,3 13,4 Шаблон:Cite journal
Источник — http://wikihandbk.com/ruwiki/index.php?title=Английская_Википедия:Cañadón_Calcáreo_Formation&oldid=13818879