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Subachoque Formation

The Subachoque Formation (Spanish: Formación Subachoque, Q1su) is a geological formation of the Bogotá savanna, Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists mainly of sandy shales and lignite with sandstone beds. The Subachoque Formation dates to the Quaternary period; Early to Middle Pleistocene epoch (from approximately 2.5 to 1 Ma), and has a maximum thickness of 150 metres (490 ft). It is the lowermost formation of the lacustrine and fluvio-glacial sediments of Lake Humboldt.

Etymology

The formation was first defined and named by Helmens and Van der Hammen in 1995 after Subachoque, Cundinamarca.[1]

Description

Lithologies

The Subachoque Formation consists mainly of sandy shales, some organic, with lignite and sandstone beds.[1]

Stratigraphy and depositional environment

The Subachoque Formation is the lowermost of the lagunal and alluvial sequence of the Bogotá savanna. In parts, it conformably overlies the Tilatá Formation and other parts unconformably the Cretaceous Guadalupe Group and the Paleogene Guaduas, Cacho, Bogotá, and Regadera Formations. The Subachoque Formation is overlain by other Quaternary deposits of Lake Humboldt. The age has been estimated to be Early to Middle Pleistocene based on fission track analysis, with reported ages between 2.5 and 1 Ma.[2] The depositional environment has been interpreted as lacustrine and fluvio-glacial with alluvial fans.[1]

Outcrops

Subachoque Formation is located in the Bogotá savanna
Subachoque Formation
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Type locality of the Subachoque Formation on the northwestern Bogotá savanna

The Subachoque Formation is found at its type locality in the western flank of the synclinal of Subachoque and in the western flank of the synclinal of Guasca.[1] The deposition of the Subachoque Formation postdates the main reverse movement of the Bogotá Fault.[3]

Regional correlations

Legend


See also

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

Notes

  1. ^ based on Duarte et al. (2019)[40], García González et al. (2009),[41] and geological report of Villavicencio[42]
  2. ^ based on Duarte et al. (2019)[40] and the hydrocarbon potential evaluation performed by the UIS and ANH in 2009[43]

References

  1. ^ a b c d Montoya & Reyes, 2005, p.69
  2. ^ Montoya & Reyes, 2005, p.71
  3. ^ Geological Map Bogotá, 1997
  4. ^ a b c d e f García González et al., 2009, p.27
  5. ^ a b c d e f García González et al., 2009, p.50
  6. ^ a b García González et al., 2009, p.85
  7. ^ a b c d e f g h i j Barrero et al., 2007, p.60
  8. ^ a b c d e f g h Barrero et al., 2007, p.58
  9. ^ Plancha 111, 2001, p.29
  10. ^ a b Plancha 177, 2015, p.39
  11. ^ a b Plancha 111, 2001, p.26
  12. ^ Plancha 111, 2001, p.24
  13. ^ Plancha 111, 2001, p.23
  14. ^ a b Pulido & Gómez, 2001, p.32
  15. ^ Pulido & Gómez, 2001, p.30
  16. ^ a b Pulido & Gómez, 2001, pp.21-26
  17. ^ Pulido & Gómez, 2001, p.28
  18. ^ Correa Martínez et al., 2019, p.49
  19. ^ Plancha 303, 2002, p.27
  20. ^ Terraza et al., 2008, p.22
  21. ^ Plancha 229, 2015, pp.46-55
  22. ^ Plancha 303, 2002, p.26
  23. ^ Moreno Sánchez et al., 2009, p.53
  24. ^ Mantilla Figueroa et al., 2015, p.43
  25. ^ Manosalva Sánchez et al., 2017, p.84
  26. ^ a b Plancha 303, 2002, p.24
  27. ^ a b Mantilla Figueroa et al., 2015, p.42
  28. ^ Arango Mejía et al., 2012, p.25
  29. ^ Plancha 350, 2011, p.49
  30. ^ Pulido & Gómez, 2001, pp.17-21
  31. ^ Plancha 111, 2001, p.13
  32. ^ Plancha 303, 2002, p.23
  33. ^ Plancha 348, 2015, p.38
  34. ^ Planchas 367-414, 2003, p.35
  35. ^ Toro Toro et al., 2014, p.22
  36. ^ Plancha 303, 2002, p.21
  37. ^ a b c d Bonilla et al., 2016, p.19
  38. ^ Gómez Tapias et al., 2015, p.209
  39. ^ a b Bonilla et al., 2016, p.22
  40. ^ a b Duarte et al., 2019
  41. ^ García González et al., 2009
  42. ^ Pulido & Gómez, 2001
  43. ^ García González et al., 2009, p.60

Bibliography

Maps

Further reading

External links