Coquimbo Formation
Geological formation in Chile
Coquimbo Formation | |
---|---|
Stratigraphic range: Miocene–Mid Pleistocene ~23–1.2 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |
![]() 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 | ![]() ![]() 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]
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
References
- ^ 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" (PDF). Sedimentary Geology. 184 (1–2): 133–153. Bibcode:2006SedG..184..133L. doi:10.1016/j.sedgeo.2005.09.023. Retrieved 11 April 2016.
- ^ Coquimbo at Fossilworks.org
- ^ Bahia de Guayacan at Fossilworks.org
- ^ Bahia Herradura at Fossilworks.org
- ^ La Cantera at Fossilworks.org
- ^ Chanaral de Aceituno at Fossilworks.org
- ^ Tongoy area Unit 11 at Fossilworks.org
- ^ 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; Hernández, Sebastián; López, Patricio; Villafaña, Jaime A.; Varas, Cristian; Soto, Luis Patricio; Carrillo Briceño, Jorge D. (2015), "Late Neogene Elasmobranch fauna from the Coquimbo Formation, Chile", Revista Brasileira de Paleontologia, 18 (2): 261–272, doi:10.4072/rbp.2015.2.07, retrieved 2017-08-15
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