The Capotes Formation (Spanish: Formación Capotes, Kic) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists of calcareous black shales containing gypsum and ammonites and dates to the Early Cretaceous period; Early Albian epoch and has an approximate thickness at its type section of 550 metres (1,800 ft).

Capotes Formation
Stratigraphic range: Early Albian
~112–108 Ma
TypeGeological formation
Unit ofVilleta Group
UnderliesHiló Formation
OverliesEl Peñón Fm., Socotá Fm.
Thickness550 m (1,800 ft)
Lithology
PrimaryCalcareous black shale
OtherGypsum
Location
Coordinates5°15′13″N 74°20′28″W / 5.25361°N 74.34111°W / 5.25361; -74.34111
RegionEastern Ranges, Andes
Country Colombia
Type section
Named forHacienda Capotes, Viotá
Named byCáceres & Etayo
LocationBituima-Guayabal
Year defined1969
Coordinates5°15′13″N 74°20′28″W / 5.25361°N 74.34111°W / 5.25361; -74.34111
RegionCundinamarca
Country Colombia
Thickness at type section550 m (1,800 ft)

Paleogeography of Northern South America
105 Ma, by Ron Blakey

Etymology

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The formation was defined in 1969 by Cáceres and Etayo as a member of the Socotá Formation.[1][2] The name is derived from Hacienda Capotes, southeast of Viotá.[3]

Description

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Lithologies

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The Capotes Formation has a thickness at its type section of approximately 550 metres (1,800 ft), and is characterised by a sequence of organic rich calcareous shales with gypsum. Fossils of Douvilleiceras solitae, Neodeshayesites columbianus and Paracrioceras sp. have been found in the Capotes Formation.[2][4]

Stratigraphy and depositional environment

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The Capotes Formation, part of the Villeta Group, overlies the Socotá and El Peñón Formations, and is overlain by the Hiló Formation. The age has been estimated to be Early Albian. Stratigraphically, the formation is time equivalent with the Simití Formation.[5] The formation has been deposited in a quiet enclosed shallow marine environment.[2] In terms of sequence stratigraphy, the Albian of current central Colombia experienced a transgressive to highstand sequence.[6]

Outcrops

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Type locality of the Capotes Formation to the west of the Altiplano Cundiboyacense

The Capotes Formation is apart from its type locality along the road between Bituima and Guayabal,[2] also found north and southeast of Viotá,[7] and north and east of La Mesa.[8]

Regional correlations

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See also

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  Geology of the Eastern Hills
  Geology of the Ocetá Páramo
  Geology of the Altiplano Cundiboyacense

References

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  1. ^ Acosta & Ulloa, 2002, p.41
  2. ^ a b c d Acosta & Ulloa, 2002, p.42
  3. ^ Vargas & Barrantas, 2013, p.8
  4. ^ Moreno Bedmar et al., 2015
  5. ^ Acosta & Ulloa, 2001, p.91
  6. ^ Villamil, 2012, p.169
  7. ^ Plancha 246, 1998
  8. ^ Plancha 227, 1998

Bibliography

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  • Acosta Garay, Jorge E.; Ulloa Melo, Carlos E. (2002), Mapa Geológico del Departamento de Cundinamarca - 1:250,000 - Memoria explicativa, INGEOMINAS, pp. 1–108, retrieved 2017-06-05
  • Acosta Garay, Jorge; Ulloa Melo, Carlos E (2001), Geología de la Plancha 208 Villeta - 1:100,000 (PDF), INGEOMINAS, pp. 1–84, archived from the original (PDF) on 2017-03-24, retrieved 2017-06-05 Archived 2017-03-24 at the Wayback Machine
  • Moreno Bedmar, J.A; Martínez, R.; Rodríguez, J.V.; Bermúdez, Hermann Durán (2015), Algunos ammonites del Cretácico de la Cordillera Oriental de Colombia, XV Congreso Colombiano de Geología, 2015, pp. _, retrieved 2017-06-05
  • Vargas Quintero, Jhonn; Barrantas, Daniel Mauricio (2013), Efectos del tránsito en la estabilidad de taludes, Universidad La Javeriana, pp. 1–185
  • Villamil, Tomas (2012), Chronology Relative Sea Level History and a New Sequence Stratigraphic Model for Basinal Cretaceous Facies of Colombia, Society for Sedimentary Geology (SEPM), pp. 161–216

Maps

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