Guichón Formation

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Guichón Formation
Stratigraphic range: Aptian-Santonian
~125–85  Ma
Type Geological formation
Unit of Paysandú Group
Underlies Mercedes Formation
Overlies Arapey Formation
ThicknessUp to >100 m (330 ft) (in wells)
Lithology
Primary Sandstone
Other Conglomerate
Location
Coordinates 32°00′S57°42′W / 32.0°S 57.7°W / -32.0; -57.7
Approximate paleocoordinates 38°24′S30°00′W / 38.4°S 30.0°W / -38.4; -30.0
Region Paysandú Department
CountryFlag of Uruguay.svg  Uruguay
Extent Norte Basin
Type section
Named for Guichón
Uruguay topographic location map.png
Lightgreen pog.svg
Guichón 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. [1]

Contents

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 alluvialfluvial 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 correlated to the Puerto Yeruá Formation of northwestern Argentina. [3]

The formation reaches a thickness of more than 100 metres (330 ft) in wells perforating the formation. [4] It is overlain by the Mercedes Formation and overlies the Arapey Formation. [5]

Fossil content

The following fossils have been reported from the formation: [2] [6]

Fossil eggs

See also

Related Research Articles

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References

  1. Weishampel et al., 2004, pp.517-607
  2. 1 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. 1 2 Soto et al., 2011
  10. Soto et al., 2012

Bibliography