Huitrera Formation

The Huitrera Formation is a geological formation in the Neuquén Basin in northern Patagonian Argentina whose strata date back to the Early Eocene of the Paleogene, or Casamayoran in the South American land mammal age classification.

Huitrera Formation
Stratigraphic range: Early Eocene (Casamayoran)
54.69–53.79 Ma
TypeGeological formation
UnderliesCollón Curá Formation
OverliesAngostura Colorada Formation
ThicknessUp to 1,300 m (4,300 ft)
Lithology
PrimaryMudstone, sandstone
OtherAndesites, dacitic & rhyolitic ignimbrites, volcanic breccias, tuffs & trachybasalts
Location
Coordinates41.0°S 71.2°W / -41.0; -71.2
Approximate paleocoordinates43.5°S 61.2°W / -43.5; -61.2
RegionNeuquén & Río Negro Provinces
Country Argentina
ExtentNeuquén Basin
Type section
Named forCerro Huitrera
Named byRavazzoli & Sesana
Year defined1977
Huitrera Formation (Argentina)

Description

Late Eocene (50 Ma)

The Huitrera Formation was first defined by Ravazzoli and Sesana in 1977. The name has been used to identify various volcaniclastic sequences, among others in the Ñirihuau fold-and-thrust belt.[1] The up to 1,300 metres (4,300 ft) thick formation comprises mudstones and sandstones deposited in a crater lake environment. Part of the formation comprises andesites, dacitic and rhyolitic ignimbrites, volcanic breccias, tuffs and trachybasalts.[2]

The formation was initially described as Late Eocene to Early Oligocene, but was later dated to 54.24 ± 0.45 Ma, meaning the Huitrera Formation is Ypresian, or in the SALMA classification, Casamayoran in age.

Fossil content

The following macrofossils were reported from the formation:[3]

The formation has also provided many pollen, analyzed in 2003 by Melendi et al.[10]

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gollark: It lead to a bit of a lack of neutrality.
gollark: We had religion lessons at school, which were mostly just "read the wikipedia page and/or random internet resources for this religion and make a PowerPoint presentation" but one year we were doing Christianity, taught by someone who... was a Christian, which was kind of problematic.
gollark: Much better than religion lessons, which were somewhat uncool.
gollark: We did something like six philosophy lessons last school year for some reason. It was pretty neat, actually.

See also

References

  1. Escosteguy & Franchi, 2010, p.420
  2. Prez & Massafero, 2013, p.228
  3. Huitrera Formation at Fossilworks.org
  4. Báez & Pugener, 2003
  5. Aranciaga et al., 2019
  6. Jin et al., 2020
  7. Ramírez et al., 2016
  8. Jud et al., 2018
  9. Barrera et al., 2012
  10. Melendi et al., 2003

Bibliography

  • Jin, Mengjie; Andreas Zwick; Adam Ślipiński; John W. M. Marris; Michael C. Thomas, and Hong Pang. 2020. A comprehensive phylogeny of flat bark beetles (Coleoptera: Cucujidae) with a revised classification and a new South American genus. Systematic Entomology 45. 248–268. doi:10.1111/syen.12392
  • Aranciaga Rolando, Alexis M.; Federico L. Agnolin, and Julián Corsolini. 2019. A new pipoid frog (Anura, Pipimorpha) from the Paleogene of Patagonia. Paleobiogeographical implications. Comptes Rendus Palevol 18. 725–734. doi:10.1016/j.crpv.2019.04.003
  • Jud, Nathan A.; Ari Iglesias; Peter Wilf, and Maria A. Gandolfo. 2018. Fossil moonseeds from the Paleogene of West Gondwana (Patagonia, Argentina). American Journal of Botany 105. 927–942. doi:10.1002/ajb2.1092 PMID 29882954
  • Ramírez, Leonardo C.; Juan Corsolini, and Osvaldo Di Iorio. 2016. First fossil record of parasitic flat-bark beetle (Coleoptera: Passandridae) from the Eocene of Patagonia, Argentina. Ameghiniana 53. 160–169. doi:10.5710/AMGH.29.11.2015.2920
  • Prez, Horacio, and Gabriela Massaferro. 2013. Geología y geomorfología del tramo superior del Arroyo Comallo, Río Negro. Contribuciones Científicas GÆA 26. 221–234. Accessed 2020-06-13.
  • Barreda, V.D.; L. Palazzesi; L. Katinas; J.V. Criscri; M.C. Telleria; K. Bremer; M.G. Passala; F. Bechis, and R. Corsolini. 2012. An extinct Eocene taxon of the daisy family (Asteraceae): evolutionary, ecological and biogeographical implications. Annals of Botany 109. 127-134.
  • Escosteguy, Leonardo, and Mario Franchi. 2010. Estratigrafía de la región de Chapelco, Provincia del Neuquén. Revista de la Asociación Geológica Argentina 66. 418–429. Accessed 2020-06-13.
  • Báez, Ana M., and L. Analia Pugener. 2003. Ontogeny of a new Palaeogene pipid frog from southern South America and xenopodinomorph evolution. Zoological Journal of the Linnean Society 139. 439–476. doi:10.1046/j.1096-3642.2003.00085.x
  • Melendi, D.L.; L.H. Scafati, and W. Volkheimer. 2003. Palynostratigraphy of the Paleogene Huitrera Formation in N-W Patagonia, Argentina. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 228. 205-273.
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