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Guichón Formation

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Late Cretaceous geological formation in Uruguay
Guichón Formation
Stratigraphic range: Aptian-Santonian
~125–85 Ma PreꞒ Ꞓ O S D C P T J K Pg N
TypeGeological formation
Unit ofPaysandú Group
UnderliesMercedes Formation
OverliesArapey Formation
ThicknessUp to >100 m (330 ft) (in wells)
Lithology
PrimarySandstone
OtherConglomerate
Location
Coordinates32°00′S 57°42′W / 32.0°S 57.7°W / -32.0; -57.7
Approximate paleocoordinates38°24′S 30°00′W / 38.4°S 30.0°W / -38.4; -30.0
RegionPaysandú Department
Country Uruguay
ExtentNorte Basin
Type section
Named forGuichón
Guichón Formation is located in UruguayGuichón FormationGuichón Formation (Uruguay)

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.

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. The formation has been correlated to the Puerto Yeruá Formation of northwestern Argentina.

The formation reaches a thickness of more than 100 metres (330 ft) in wells perforating the formation. It is overlain by the Mercedes Formation and overlies the Arapey Formation.

Fossil content

The following fossils have been reported from the formation:

Fossil eggs

See also

References

  1. Weishampel et al., 2004, pp.517-607
  2. ^ Guichón at Fossilworks.org
  3. Soto et al., 2009, p.13
  4. Tofalo et al., 2011, p.616
  5. Tofalo et al., 2011, p.617
  6. Soto et al., 2009, p.19
  7. Soto, M.; Carballido, J. L.; Langer, M. C.; Silva Junior, J. C. G.; Montenegro, F.; Perea, D. (2024). "Phylogenetic relationships of a new titanosaur (Dinosauria, Sauropoda) from the Upper Cretaceous of Uruguay". Cretaceous Research. 160. 105894. doi:10.1016/j.cretres.2024.105894.
  8. Mones, 1972
  9. ^ Soto et al., 2011
  10. Soto et al., 2012

Bibliography

Stratigraphic formations of Uruguay
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