Guichón Formation

Guichón Formation
Stratigraphic range: Late Cretaceous
Type Geological formation
Unit of Paysandú Group
Lithology
Primary Sandstone
Other Conglomerate
Location
Coordinates 32°00′S 57°42′W / 32.0°S 57.7°W / -32.0; -57.7Coordinates: 32°00′S 57°42′W / 32.0°S 57.7°W / -32.0; -57.7
Approximate paleocoordinates 38°24′S 30°00′W / 38.4°S 30.0°W / -38.4; -30.0
Region Paysandú Department
Country  Uruguay
Extent Norte Basin
Type section
Named for Guichón

The Guichón Formation is a Late Cretaceous geologic formation of the Paysandú Group in Uruguay. Dinosaur remains are among the fossils that have been recovered from the formation.[1]

Description

The Guichón Formation comprises mainly pink-greyish to reddish sandstones, which contain moderate to well-sorted, subrounded, fine to medium-sized grains in a pelitic matrix. These sandstones (which compositionally are feldspathic wackes) are either massive or may instead exhibit parallel lamination, cross-lamination and graded bedding. These lithologies were deposited in southwest-trending alluvial–fluvial systems comprising low-sinuosity channels traversing through sandy plains. Subordinate to the already mentioned sandstones are conglomeratic and pelitic lithologies, interpreted as channel-fill and overbank deposits, respectively. It is inferred that the Guichón Formation was deposited in warm, semi-arid climatic conditions.[2] The formation has been correlates to the Puerto Yeruá Formation of northwestern Argentina.[3]

Fossil content

The following fossils have been reported from the formation:[2][4]

See also

References

  1. ↑ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
  2. 1 2 Guichón at Fossilworks.org
  3. ↑ Soto et al., 2009, p.13
  4. ↑ Soto et al., 2009, p.19

Bibliography

  • Soto, M.; D. Perea; G. Veroslavsky; A. Rinderknecht; M. Ubilla, and G. Lecuona. 2009. Nuevos hallazgos de restos de dinosaurios y consideraciones sobre la edad de la Formación Guichón - New findings of dinosaur remains and considerations on the age of the Guichón Formation. Revista Sociedad Uruguaya de Geología 15. 11–23. Accessed 2018-09-07.
  • Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp.  ISBN 0-520-24209-2.

Further reading

  • M. Soto, D. Perea, and A. Cambiaso. 2012. First sauropod (Dinosauria: Saurischia) remains from the Guichón Formation, Late Cretaceous of Uruguay. Journal of South American Earth Sciences 33:68-79
  • F. von Huene. 1934. Neue Saurier-Zähne aus der Kreide von Uruguay [New saurian teeth from the Cretaceous of Uruguay]. Centralblatt für Mineralogie, Geologie und Paläontologie, Abteilung B: Geologie und Paläontologie 1934(4):183-189
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