Pisco_Basin

Pisco Basin

Pisco Basin

Peruvian sedimentary basin


Pisco Basin (Spanish: Cuenca de Pisco) is a sedimentary basin extending over 300 kilometres (190 mi) in southwestern Peru.[1] The basin has a 2 kilometres (6,600 ft) thick sedimentary fill, which is about half the thickness of more northern foreland basins in Peru.[2]

Quick Facts Coordinates, Etymology ...

The oldest known sediments are the Eocene sandstones of the Caballas Formation, while the youngest deposits, the fossiliferous Pisco Formation, date to the Early Pleistocene.[2][note 1] In relation to present-day, topography the fill of Pisco Basin makes the upper part of the Coastal Cordillera of southern Peru, the coastal plains, the Ica-Nazca Depression and the Andean foothills.[3]

The basin is renowned for hosting various highly fossiliferous stratigraphic units; the Pisco Formation has provided a wealth of marine mammals (including sloths), birds, fish and other groups, as have the Chilcatay, Otuma and Paracas Formations.

Stratigraphy

More information Age, SALMA ...

Tectonic and sedimentary evolution

The basin developed in a setting of extensional tectonics from Eocene to the Late Miocene with short-lived episode of basin inversion in the Middle Miocene.[7] Late Pliocene and Pleistocene uplift of the basin may be consequence of the subduction of Nazca Ridge.[2][8]

Sedimentary strata of the basin shows evidence for a series of marine transgressions during the last 50 million years.[9] These marine transgressions occurred in a sequence 41-34 Ma, 31-28 Ma, 25-16 Ma, 15-11 Ma, 10-5 Ma, and 4-2 Ma.[9] The end of most of the marine transgressions is thought to be associated either with global sea level falls or compressional events in the Andes.[9]

Oligo-Miocene transgression

The marine Oligo-Miocene (25–16 Ma[9]) marine transgression is evidenced by a series of sedimentary strata containing fossils of marine diatoms, Peruchilus snails and Pitar and Cucullaea clams.[10] Oligo-Miocene marine environments in the Pisco Basin range from littoral to shelf.[10] Moquegua Basin southeast of Pisco Basin appear to have been unaffected by the transgression.[10]

Within the Andean margin contemporary marine transgressions are also known from southern Chile, Patagonia and Colombia.[10] As such the marine transgression is thought to represent a regional phenomenon with the steadily rising central Andes being an exception.[10]

Paleontology

Pisco Formation

Chilcatay Formation

Otuma Formation

Paracas Formation

See also


Notes and references

Notes

  1. later publications give a younger top date
  2. Based on "DeVries (1998) as presented by León et al. (2007)"[4]

References

  1. Solís Mundaca, 2018, p.1
  2. Dunbar et al., 1990
  3. León et al. 2007, p. 7.
  4. León et al. 2007, p. 44.
  5. DeVries et al., 2017
  6. León et al. 2007, p. 45.
  7. León et al. 2007, p. 146.
  8. León et al. 2007, p. 145.
  9. DeVries, 1998
  10. Macharé et al., 1988
  11. Lambert et al., 2017
  12. Lambert, Olivier; Bianucci, Giovanni; Salas-Gismondi, Rodolfo; Di Celma, Claudio; Steurbaut, Etienne; Urbina, Mario; de Muizon, Christian (2019). "An Amphibious Whale from the Middle Eocene of Peru Reveals Early South Pacific Dispersal of Quadrupedal Cetaceans". Current Biology. 29 (8): 1352–1359.e3. doi:10.1016/j.cub.2019.02.050. hdl:11581/425570. ISSN 0960-9822.
  13. Bianucci, Giovanni; Lambert, Olivier; Urbina, Mario; Merella, Marco; Collareta, Alberto; Bennion, Rebecca; Salas-Gismondi, Rodolfo; Benites-Palomino, Aldo; Post, Klaas; de Muizon, Christian; Bosio, Giulia; Di Celma, Claudio; Malinverno, Elisa; Pierantoni, Pietro Paolo; Villa, Igor Maria (2023-08-02). "A heavyweight early whale pushes the boundaries of vertebrate morphology". Nature: 1–6. doi:10.1038/s41586-023-06381-1. ISSN 1476-4687.
  14. Collareta, Alberto; Tejada-Medina, Luz; Chacaltana-Budiel, César; Landini, Walter; Altamirano-Sierra, Alí; Urbina-Schmitt, Mario; Bianucci, Giovanni (2020-03-17). "A rhinopristiform sawfish (genus Pristis) from the middle Eocene (Lutetian) of southern Peru and its regional implications". Carnets Geol. 20 (05): 91. doi:10.4267/2042/70759. hdl:20.500.12544/2621. ISSN 1634-0744.

Bibliography

Stratigraphy

Geology publications

Paleontology publications

Further reading

Chilcatay Formation
Paracas Group
Pisco Formation

Share this article:

This article uses material from the Wikipedia article Pisco_Basin, 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.