Barzalosa_Formation

Barzalosa Formation

Barzalosa Formation

Geological formation in the Colombian Andes

The Barzalosa Formation (Spanish: Formación Barzalosa, Pgb, Pgba) is a fossiliferous geological formation of the Upper Magdalena Valley and the bounding foothills of the Central Ranges and Eastern Ranges of the Colombian Andes. The formation consists of conglomerates, sandstones and siltstones. The Barzalosa Formation probably dates to the Late Paleogene to Early Neogene period; Oligocene to Early Miocene epochs, and has an approximate thickness of 360 metres (1,180 ft). Fossils of Balanerodus logimus, Lophiodolodus chaparralensis, Xenastrapotherium chaparralensis, Protheosodon sp. and Proadinotherium sp. have been uncovered from the formation in Chaparral, Tolima.

Quick Facts Type, Underlies ...

Etymology

The formation was defined by Scheibe in 1934 and named after Barzalosa, a vereda of Girardot, Cundinamarca. Cáceres and Etayo elevated the "Pisos de Barzalosa" to a formation in 1969.[1]

Description

Lithologies

The Barzalosa Formation consists of conglomerates, sandstones and siltstones.[2] In parts, the formation contains shale beds and gypsum.[3]

Stratigraphy and depositional environment

The approximately 360 metres (1,180 ft) thick Barzalosa Formation overlies the Olini Group and the Seca Formation in the west and is overlain by the Honda Group.[2] In the east towards Fusagasugá, the formation overlies the La Tabla Formation and is overlain by the Carmen de Apicalá Conglomerate.[4] As the formation does not contain foraminifera, the age is difficult to establish, but has been estimated to be Oligocene to Early Miocene,[2] or Middle Eocene to Oligocene.[5] The depositional environment has been interpreted as alluvial fans and braided rivers.[6]

Fossil content

More information Location, Department ...

Outcrops

Barzalosa Formation
Type locality of the Barzalosa Formation to the southwest of the Bogotá savanna

The Barzalosa Formation is apart from its type locality found in Tocaima and to the east of Agua de Dios,[1] and on the western side of the Magdalena River around Chaparral, Tolima.[12]

Regional correlations

More information Ma, Age ...
Legend
  • group
  • important formation
  • fossiliferous formation
  • minor formation
  • (age in Ma)
  • proximal Llanos (Medina)[note 1]
  • distal Llanos (Saltarin 1A well)[note 2]

See also

Geology of the Eastern Hills
Middle Magdalena Valley
Geology of the Altiplano Cundiboyacense

Notes

  1. [N 1]
    based on Duarte et al. (2019)[49], García González et al. (2009),[50] and geological report of Villavicencio[51]
  2. [N 2]
    based on Duarte et al. (2019)[49] and the hydrocarbon potential evaluation performed by the UIS and ANH in 2009[52]

References

  1. [1]
    Acosta et al., 2002, p.49
  2. [2]
    Acosta et al., 2002, p.50
  3. [3]
    Acosta & Ulloa, 2001, p.56
  4. [4]
    Acosta & Ulloa, 2001, p.52
  5. [5]
    Acosta & Ulloa, 2001, p.57
  6. [6]
    Acosta et al., 2002, p.51
  7. [7]
    Balanerodus logimus in the Paleobiology Database
  8. [8]
    Lophiodolodus chaparralensis in the Paleobiology Database
  9. [9]
    Xenastrapotherium chaparralensis in the Paleobiology Database
  10. [10]
    Protheosodon in the Paleobiology Database
  11. [11]
    Proadinotherium in the Paleobiology Database
  12. [12]
    Chaparral Alto José in the Paleobiology Database
  13. [13]
    García González et al., 2009, p.27
  14. [14]
    García González et al., 2009, p.50
  15. [15]
    García González et al., 2009, p.85
  16. [16]
    Barrero et al., 2007, p.60
  17. [17]
    Barrero et al., 2007, p.58
  18. [18]
    Plancha 111, 2001, p.29
  19. [19]
    Plancha 177, 2015, p.39
  20. [20]
    Plancha 111, 2001, p.26
  21. [21]
    Plancha 111, 2001, p.24
  22. [22]
    Plancha 111, 2001, p.23
  23. [23]
    Pulido & Gómez, 2001, p.32
  24. [24]
    Pulido & Gómez, 2001, p.30
  25. [25]
    Pulido & Gómez, 2001, pp.21-26
  26. [26]
    Pulido & Gómez, 2001, p.28
  27. [27]
    Correa Martínez et al., 2019, p.49
  28. [28]
    Plancha 303, 2002, p.27
  29. [29]
    Terraza et al., 2008, p.22
  30. [30]
    Plancha 229, 2015, pp.46-55
  31. [31]
    Plancha 303, 2002, p.26
  32. [32]
    Moreno Sánchez et al., 2009, p.53
  33. [33]
    Mantilla Figueroa et al., 2015, p.43
  34. [34]
    Manosalva Sánchez et al., 2017, p.84
  35. [35]
    Plancha 303, 2002, p.24
  36. [36]
    Mantilla Figueroa et al., 2015, p.42
  37. [37]
    Arango Mejía et al., 2012, p.25
  38. [38]
    Plancha 350, 2011, p.49
  39. [39]
    Pulido & Gómez, 2001, pp.17-21
  40. [40]
    Plancha 111, 2001, p.13
  41. [41]
    Plancha 303, 2002, p.23
  42. [42]
    Plancha 348, 2015, p.38
  43. [43]
    Planchas 367-414, 2003, p.35
  44. [44]
    Toro Toro et al., 2014, p.22
  45. [45]
    Plancha 303, 2002, p.21
  46. [46]
    Bonilla et al., 2016, p.19
  47. [47]
    Gómez Tapias et al., 2015, p.209
  48. [48]
    Bonilla et al., 2016, p.22
  49. [49]
    Duarte et al., 2019
  50. [50]
    García González et al., 2009
  51. [51]
    Pulido & Gómez, 2001
  52. [52]
    García González et al., 2009, p.60

Bibliography

  • Acosta, Jorge E.; Rafael Guatame; Juan Carlos Caicedo A., and Jorge Ignacio Cárdenas. 2002. Mapa Geológico de Colombia - Plancha 245 - Girardot - 1:100,000 - Memoria Explicativa, 1–92. INGEOMINAS.
  • Acosta, Jorge E., and Carlos E. Ulloa. 2001. Mapa Geológico de Colombia - Plancha 246 - Fusagasugá - 1:100,000 - Memoria Explicativa, 1–77. INGEOMINAS.

Maps
Share this article:

This article uses material from the Wikipedia article Barzalosa_Formation, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.