Siamaná Formation

The Siamaná Formation (Spanish: Formación Siamaná, E3s) is a fossiliferous geological formation of the Cocinetas Basin in the northernmost department of La Guajira. The formation consists of conglomerates and limestones. The Siamaná Formation dates to the Paleogene period; Middle to Late Oligocene epoch, corresponding to the Deseadan in the SALMA classification.

Siamaná Formation
Stratigraphic range: Mid-Late Oligocene
~28–23 Ma
TypeGeological formation
Unit ofCocinetas Basin
UnderliesUitpa Formation
OverliesMacarao Formation
Thickness430 m (1,410 ft)
Lithology
PrimaryConglomerate
OtherLimestone
Location
Coordinates11°58′00″N 71°22′43″W
RegionLa Guajira
 Caribbean region
Country Colombia
Type section
Named forSiamaná
Named byRenz
LocationUribia
Year defined1960
Coordinates11°58′00″N 71°22′43″W
RegionLa Guajira
Country Colombia

Type locality of the formation in La Guajira

Etymology

The formation was defined by Renz in 1960 and named after the village of Siamaná.[1]

Description

Lithologies

The Siamaná Formation consists of conglomerates and thick carbonates.[2]

Stratigraphy and depositional environment

The Siamaná Formation, with a maximum thickness of 430 metres (1,410 ft), overlies the Macarao Formation and is overlain by the Uitpa Formation. The age has been estimated to be Middle to Late Oligocene, corresponding to the Deseadan in the SALMA classification. The depositional environment has been interpreted as shallow marine.[3]

Petroleum geology

The Siamaná Formation is a reservoir and seal rock formation in the Guajira Basin.[4]

Fossil content

Group Fossils Notes
InvertebratesMimachlamys canalis, Ostrea sp.

See also

Geology of the Eastern Hills
Cesar-Ranchería Basin
Honda Group
Abanico, Castillo, Chota, Loreto, Soncco, Usme Formations
Tinguiririca fauna

References

  1. Moreno et al., 2015, p.7
  2. Hendy et al., 2015, p.47
  3. Rodríguez & Londoño, 2002, p.132
  4. ANH, 2010
  5. Hendy et al., 2015, p.50

Local geology

Paleontology

Maps

  • Zuluaga, Carlos A.; Alberto Ochoa; Carlos A. Muñoz; Camilo E. Dorado; Nathalia M. Guerrero; Ana M. Martínez; Paula A. Medina; Edgar F. Ocampo, and Alejandro Pinilla and Paula A. Ríos, Bibiana P. Rodríguez, Edward A. Salazar, Vladimir L. Zapata. 2008. Plancha 3 - Puerto Estrella - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
  • Zuluaga, Carlos A.; Alberto Ochoa; Carlos A. Muñoz; Camilo E. Dorado; Nathalia M. Guerrero; Ana M. Martínez; Paula A. Medina; Edgar F. Ocampo, and Alejandro Pinilla and Paula A. Ríos, Bibiana P. Rodríguez, Edward A. Salazar, Vladimir L. Zapata. 2008. Plancha 5 - Bahía Portete - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
  • Zuluaga, Carlos A.; Alberto Ochoa; Carlos A. Muñoz; Camilo E. Dorado; Nathalia M. Guerrero; Ana M. Martínez; Paula A. Medina; Edgar F. Ocampo, and Alejandro Pinilla and Paula A. Ríos, Bibiana P. Rodríguez, Edward A. Salazar, Vladimir L. Zapata. 2008. Plancha 10 - Rancho Grande - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
  • Zuluaga, Carlos A.; Alberto Ochoa; Carlos A. Muñoz; Camilo E. Dorado; Nathalia M. Guerrero; Ana M. Martínez; Paula A. Medina; Edgar F. Ocampo, and Alejandro Pinilla and Paula A. Ríos, Bibiana P. Rodríguez, Edward A. Salazar, Vladimir L. Zapata. 2008. Plancha 10bis - Rancho Grande - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
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