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Quebrada del Barro Formation

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Coordinates: 31°54′S 67°12′W / 31.9°S 67.2°W / -31.9; -67.2
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Quebrada del Barro Formation
Stratigraphic range: Norian
TypeGeological formation
Unit ofMarayes Group
UnderliesLos Riscos Formation
OverliesCarrizal Formation
Lithology
PrimarySandstone
OtherSiltstone
Location
Coordinates31°54′S 67°12′W / 31.9°S 67.2°W / -31.9; -67.2
Approximate paleocoordinates40°48′S 30°00′W / 40.8°S 30.0°W / -40.8; -30.0
RegionSan Juan Province
Country Argentina
ExtentMarayes-El Carrizal Basin
Quebrada del Barro Formation is located in Argentina
Quebrada del Barro Formation
Quebrada del Barro Formation (Argentina)

The Quebrada del Barro Formation is a geological formation of the Marayes-El Carrizal Basin in San Juan Province, Argentina. The formation underlies the Los Riscos Formation and overlies the Carrizal Formation.[1]

Its fossils date back to the Late Triassic epoch of the Triassic period.[2] Part of the formation may be made into a provincial park following the discovery of the fossils of Ingentia, a giant dinosaur.[3]

Fossil content

Dinosaurs

Theropods of the Quebrada del Barro Formation
Genus Species Material Notes Images
Lucianovenator[4] L. bonoi Several specimens including vertebrae, hip fragments, and a partial tibia A coelophysid theropod
Sauropodomorphs of the Quebrada del Barro Formation
Genus Species Material Notes Images

Ingentia[5]

I. prima

"cervical and dorsal vertebrae, scapula"

A lessemsaurid sauropod

Leyesaurus L. marayensis A massospondylid sauropodomorph
Riojasaurus[6] R. incertus "a skull, leg bones, vertebrae" A riojasaurid sauropodomorph

Other avemetatarsalians

Non-dinosaur avemetatarsalias of the Quebrada del Barro Formation
Genus Species Material Notes Images
Dromomeron[7] D. gigas A partial femur a lagerpetid dinosauromorph
Pterosauria sp. Portion of a snout and ulna an indeterminate pterosaur

Pseudosuchians

Pseudosuchias of the Quebrada del Barro Formation
Genus Species Material Notes Images
"Rauisuchidae" sp. Skull fragments, osteoderms an indeterminate "rauisuchid" smaller than Fasolasuchus
Crocodylomorpha sp. A specimen including a partial osteoderm and vertebrae fragments Indeterminate, possibly a "sphenosuchid"
Crocodylomorpha sp. Two incomplete specimens including osteoderms, vertebrae, and other bones a protosuchid, possibly synonymous with Hemiprotosuchus

Rhynchocephalians

Rhynchocephalians of the Quebrada del Barro Formation
Genus Species Material Notes Images
Sphenotitan[8] S. leyesi numerous specimens (~50% of all recovered fossils) a opisthodont sphenodontian

Other reptiles

Other reptiles of the Quebrada del Barro Formation
Genus Species Material Notes Images
Archosauriformes sp. Maxilla, caudal vertebra, metatarsal, indeterminate limb bone (tibia?) Various indeterminate fragments likely belonging to pseudosuchians or dinosauromorphs
Testudinata sp. 2 partial skeletons and carapaces an undescribed species of stem-turtle

Synapsids

Synapsids of the Quebrada del Barro Formation
Genus Species Material Notes Images
Tritheledontidae sp. 36 specimens, including a partial skeleton an undescribed tritheledontid cynodont. May be two taxa based on two morphotypes: "long-snout" and "short-snout".

References

  1. ^ Gardini et al., 2009, p.554
  2. ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Triassic, South America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 527–528. ISBN 0-520-24209-2.
  3. ^ "Uac wants a provincial park in the cradle of Ingenia Prima". Naaju. Retrieved 2018-07-15.
  4. ^ Ricardo N. Martínez; Cecilia Apaldetti (2017). "A late Norian-Rhaetian coelophysid neotheropod (Dinosauria, Saurischia) from the Quebrada del Barro Formation, northwestern Argentina". Ameghiniana. in press. doi:10.5710/AMGH.09.04.2017.3065.
  5. ^ Apaldetti; Martínez, Ricardo N.; Cerda, Ignatio A.; Pol, Diego; Alcober, Oscar (2018). "An early trend towards gigantism in Triassic sauropodomorph dinosaurs". Nature Ecology & Evolution. 2 (8): 1227–1232. doi:10.1038/s41559-018-0599-y. PMID 29988169.
  6. ^ "Riojasaurus." In: Dodson, Peter & Britt, Brooks & Carpenter, Kenneth & Forster, Catherine A. & Gillette, David D. & Norell, Mark A. & Olshevsky, George & Parrish, J. Michael & Weishampel, David B. The Age of Dinosaurs. Publications International, LTD. p. 41. ISBN 0-7853-0443-6.
  7. ^ Ricardo N. Martínez; Cecilia Apaldetti; Gustavo A. Correa; Diego Abelín (2016). "A Norian lagerpetid dinosauromorph from the Quebrada del Barro Formation, northwestern Argentina". Ameghiniana. 53 (1): 1–13. doi:10.5710/AMGH.21.06.2015.2894.
  8. ^ Martinez, R. N.; Apaldetti, C.; Colombi, C. E.; Praderio, A.; Fernandez, E.; Malnis, P. S.; Correa, G. A.; Abelin, D.; Alcober, O. (2013). "A new sphenodontian (Lepidosauria: Rhynchocephalia) from the Late Triassic of Argentina and the early origin of the herbivore opisthodontians". Proceedings of the Royal Society B: Biological Sciences. 280 (1772): 20132057. doi:10.1098/rspb.2013.2057. PMC 3813332. PMID 24132307.

Bibliography

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