Coquimbo Formation
Stratigraphic range: Miocene–Mid Pleistocene
~23–1.2 Ma

PreЄ

Marine terrace exposing strata of the Coquimbo Formation, at Caleta Hornos

Type| Geological formation
Underlies| Alluvium
Overlies| Liman Formation
Thickness| 63 m (207 ft)
Lithology
Primary| Conglomerate, sandstone, siltstone, shale and coquina
Other| Clay lenses, terra rossa
Location
Coordinates|  [ ⚑ ] : 30°20′21″S 71°32′03″W﻿ / ﻿30.33917°S 71.53417°W﻿ / -30.33917; -71.53417
Paleocoordinates|  [ ⚑ ] 30°06′S 70°18′W﻿ / ﻿30.1°S 70.3°W﻿ / -30.1; -70.3
Region| Coquimbo Region
Country|  Chile
Extent| Tongoy Bay
Type section
Named for| Coquimbo

Coquimbo Formation (Chile)

Coquimbo Formation (Spanish: Formación Coquimbo) is a Miocene to Middle Pleistocene sedimentary formation located in Coquimbo Region in Norte Chico, Chile . The lowermost unit belongs to the lower Miocene, with the third-deepest unit dated at 11.9 ± 1.0 Ma. The uppermost unit of the formation is estimated at 1.2 Ma. In the area of Tongoy, the Coquimbo Formation was deposited in an ancient bay that was formed in a graben or half-graben, with a normal fault dipping east. Sea level changes during the Holocene have caused erosion to cut several marine terraces into the formation.[1]

## Contents

* 1 Fossil content
* 2 See also
* 3 References
* 4 Further reading

## Fossil content

The following fossils have been found in the formation:

SALMA  | Group  | Fossils  | Notes

|
|
|

Montehermosan | Mammals | Delphinus domeykoi, Megaptera hubachi, Pliopontos sp., ?Squalodon sp., Balaenidae indet. |

[2][3]
[4]

Birds | cf. Palaeospheniscus sp., Spheniscus sp., Diomedeidae indet., Spheniscidae indet. |

[5][6]

Fish | Carcharodon carcharias |

[7]

Mayoan | Cosmopolitodus hastalis |

[8]

## See also

* Cerro Ballena
* Elqui-Limarí Batholith
* Caleta Herradura Formation
* Navidad Formation
* Pisco Formation

## References

1. ↑ Le Roux, J.P.; Olivares, Danisa M.; Nielsen, Sven N.; Smith, Norman D.; Middleton, Heather; Fenner, Juliane; Ishman, Scott E. (2006). "Bay sedimentation as controlled by regional crustal behaviour, local tectonics and eustatic sea-level changes: Coquimbo Formation (Miocene–Pliocene), Bay of Tongoy, central Chile". Sedimentary Geology 184 (1–2): 133–153. doi:10.1016/j.sedgeo.2005.09.023. Bibcode: 2006SedG..184..133L. http://repositorio.uchile.cl/bitstream/handle/2250/124905/LeRoux_JP.pdf?sequence=1&isAllowed=y. Retrieved 11 April 2016.
2. ↑ Coquimbo at Fossilworks.org
3. ↑ Bahia de Guayacan at Fossilworks.org
4. ↑ Bahia Herradura at Fossilworks.org
5. ↑ La Cantera at Fossilworks.org
6. ↑ Chanaral de Aceituno at Fossilworks.org
7. ↑ Tongoy area Unit 11 at Fossilworks.org
8. ↑ Tongoy area Unit 4 at Fossilworks.org

## Further reading

* C. Acosta Hospitaleche, J. Canto, and C. P. Tambussi. 2006. Pingüinos (Aves, Spheniscidae) en Coquimbo (Mioceno Medio-Plioceno Tardio), Chile y su vinculación con las corrientes oceánicas. Revista Española de Paleontología 21(1):115-122
* Staig, Felipe; Sebastián Hernández; Patricio López; Jaime A. Villafaña; Cristian Varas; Luis Patricio Soto, and Jorge D. Carrillo Briceño. 2015. Late Neogene Elasmobranch fauna from the Coquimbo Formation, Chile. Revista Brasileira de Paleontologia 18\. 261–272. Accessed 2017-08-15.

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