Rosablanca_Formation

Rosablanca Formation

Rosablanca Formation

Geologic formation in the Andes

The Rosablanca Formation (Spanish: Formación Rosablanca, Kir) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes and the Middle Magdalena Basin. The formation consists of grey limestones, dolomites and shales with at the upper part sandstones. The formation dates to the Early Cretaceous period; Valanginian epoch and has a thickness of 425 metres (1,394 ft) in the valley of the Sogamoso River.

Quick Facts Type, Underlies ...

Definition

The formation was first defined by Wheeler in 1929.[1]

Description

Lithologies

The Rosablanca Formation is characterised by a sequence of grey limestones, dolomites and shales with a maximum thickness of 425 metres (1,394 ft) in the Sogamoso River valley.[1]

Stratigraphy and depositional environment

The Rosablanca Formation overlies the Arcabuco Formation and is overlain by the Ritoque Formation. The age has been estimated to be Valanginian. Stratigraphically, the formation is time equivalent with the Macanal Formation.[1]

Fossils

Fossils of the decapod crustacean Diaulax rosablanca have been found in and named after the Rosablanca Formation.[2] In 2019, fossils of brachiopodSellithyris elizabetha were described from the formation.[3] In 2020 remains of indeterminate pterosaurs were described from the formation, including pterodactyloids and non-Pteranodontian ornithocheiroids.[4] In 2005 the remains of Platychelyid sea turtle Notoemys zapatocaensis were described,[5] and in 2023 the limbs and shell elements of protostegids were described as some of the largest Early Cretaceous turtles.[6]

Outcrops

Rosablanca Formation
Type locality of the Rosablanca Formation in Santander

The Rosablanca Formation is found, apart from its type locality on the Mesa de Los Santos, Santander, in Boyacá and the Middle Magdalena Basin.

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
Geology of the Ocetá Páramo
Geology of the Altiplano Cundiboyacense

Notes and references

Notes

  1. [N 1]
    based on Duarte et al. (2019)[43], García González et al. (2009),[44] and geological report of Villavicencio[45]
  2. [N 2]
    based on Duarte et al. (2019)[43] and the hydrocarbon potential evaluation performed by the UIS and ANH in 2009[46]

References

  1. [1]
    Galvis & Valencia, 2009, p.17
  2. [2]
    Gómez et al., 2015
  3. [3]
    Rojas & Sandy, 2019
  4. [4]
    Cadena, Edwin-Alberto; Unwin, David M.; Martill, David M. (2020-10-01). "Lower Cretaceous pterosaurs from Colombia". Cretaceous Research. 114: 104526. doi:10.1016/j.cretres.2020.104526. ISSN 0195-6671. S2CID 224886977.
  5. [5]
    E. A. Cadena Rueda, E. S. Gaffney (2005). "Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia". American Museum Novitates. 3470: 1-19. doi:10.1206/0003-0082(2005)470<0001:NZANST>2.0.CO;2.
  6. [6]
    Cadena, Edwin-Alberto; Combita-Romero, Diego A (2023-07-12). "The onset of large size in Cretaceous marine turtles (Protostegidae) evidenced by new fossil remains from the Valanginian of Colombia". Zoological Journal of the Linnean Society. doi:10.1093/zoolinnean/zlad053. ISSN 0024-4082.
  7. [7]
    García González et al., 2009, p.27
  8. [8]
    García González et al., 2009, p.50
  9. [9]
    García González et al., 2009, p.85
  10. [10]
    Barrero et al., 2007, p.60
  11. [11]
    Barrero et al., 2007, p.58
  12. [12]
    Plancha 111, 2001, p.29
  13. [13]
    Plancha 177, 2015, p.39
  14. [14]
    Plancha 111, 2001, p.26
  15. [15]
    Plancha 111, 2001, p.24
  16. [16]
    Plancha 111, 2001, p.23
  17. [17]
    Pulido & Gómez, 2001, p.32
  18. [18]
    Pulido & Gómez, 2001, p.30
  19. [19]
    Pulido & Gómez, 2001, pp.21-26
  20. [20]
    Pulido & Gómez, 2001, p.28
  21. [21]
    Correa Martínez et al., 2019, p.49
  22. [22]
    Plancha 303, 2002, p.27
  23. [23]
    Terraza et al., 2008, p.22
  24. [24]
    Plancha 229, 2015, pp.46-55
  25. [25]
    Plancha 303, 2002, p.26
  26. [26]
    Moreno Sánchez et al., 2009, p.53
  27. [27]
    Mantilla Figueroa et al., 2015, p.43
  28. [28]
    Manosalva Sánchez et al., 2017, p.84
  29. [29]
    Plancha 303, 2002, p.24
  30. [30]
    Mantilla Figueroa et al., 2015, p.42
  31. [31]
    Arango Mejía et al., 2012, p.25
  32. [32]
    Plancha 350, 2011, p.49
  33. [33]
    Pulido & Gómez, 2001, pp.17-21
  34. [34]
    Plancha 111, 2001, p.13
  35. [35]
    Plancha 303, 2002, p.23
  36. [36]
    Plancha 348, 2015, p.38
  37. [37]
    Planchas 367-414, 2003, p.35
  38. [38]
    Toro Toro et al., 2014, p.22
  39. [39]
    Plancha 303, 2002, p.21
  40. [40]
    Bonilla et al., 2016, p.19
  41. [41]
    Gómez Tapias et al., 2015, p.209
  42. [42]
    Bonilla et al., 2016, p.22
  43. [43]
    Duarte et al., 2019
  44. [44]
    García González et al., 2009
  45. [45]
    Pulido & Gómez, 2001
  46. [46]
    García González et al., 2009, p.60

Bibliography

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