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Pisco Basin

Coordinates:14°15′S76°0′W / 14.250°S 76.000°W /-14.250; -76.000
From Wikipedia, the free encyclopedia
Peruvian sedimentary basin
Pisco Basin
Cuenca de Pisco
Map showing the location of Pisco Basin
Map showing the location of Pisco Basin
Coordinates14°15′S76°0′W / 14.250°S 76.000°W /-14.250; -76.000
EtymologyCity ofPisco, Peru
LocationWestern South America
CountryPeru
State(s)Ica Region
CitiesPisco
Characteristics
On/OffshoreBoth
Part ofCircum-Pacific forearc basins
Area300 km (190 mi)
Hydrology
Sea(s)Eastern Pacific Ocean
River(s)Pisco River
Geology
Basin typeForearc basin
OrogenyAndean
AgeEocenePliocene
StratigraphyStratigraphy

Pisco Basin (Spanish:Cuenca de Pisco) is asedimentary basin extending over 300 kilometres (190 mi) in southwestern Peru.[1] The basin has a 2-kilometre (1.25-mile) thick sedimentary fill, which is about half the thickness of more northernforeland basins in Peru.[2]

The oldest known sediments are theEocenesandstones of theCaballas Formation, while the youngest deposits, the fossiliferousPisco Formation, date to theEarly Pleistocene.[2][note 1] In relation to present-day, topography the fill of Pisco Basin makes the upper part of theCoastal Cordillera of southern Peru, the coastal plains, theIca-Nazca Depression and the Andean foothills.[3]

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

Stratigraphy

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Stratigraphy of Pisco Basin[note 2]
Age[2][5]SALMA[note 3]Units[2][5]Environment[2][5]Lithology[2][5][6]
PleistoceneUquianPiscoLagoonal to near-shoreBioclasticconglomerate,sandstone
Middle MioceneColloncuran
Early MioceneColhuehuapianChilcatayMarineSiltstone, sandstone
Late OligoceneDeseadan
Early Oligocene
Late Eocene
Tinguirirican
Divisaderan
OtumaMarine embaymentBioclastic sandstone, sandstone, silty sandstone,mudstone,dolomitic sediment
Late EoceneDivisaderanParacasYumaqueMudrock,phosphatic shale,diatomite,porcellanite,chert
Late EoceneMustersanLos ChorosInner shelf,shoreface,intertidalBioclastic conglomerate, sandstone, siltstone, mudrock
EoceneCasamayoranCaballasFluvialSandstone,tuff,coal

Tectonic and sedimentary evolution

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The basin developed in a setting ofextensional tectonics from Eocene to the Late Miocene with short-lived episode of basin inversion in the Middle Miocene.[7] Late Pliocene andPleistocene uplift of the basin may be consequence of thesubduction ofNazca Ridge.[2][8]

Sedimentary strata of the basin shows evidence for a series ofmarine transgressions during the last50 million years.[9] These marine transgressions occurred in a sequence 41-34Ma, 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 withglobal sea level falls orcompressional events in the Andes.[9]

Oligo-Miocene transgression

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The marineOligo-Miocene (25–16 Ma[9]) marine transgression is evidenced by a series ofsedimentary strata containing fossils of marinediatoms,Peruchilus snails andPitar andCucullaea clams.[10] Oligo-Miocene marine environments in the Pisco Basin range from littoral toshelf.[10]Moquegua Basin southeast of Pisco Basin appear to have been unaffected by the transgression.[10]

Within theAndean 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

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Pisco Formation

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Main article:Pisco Formation § Fauna

Chilcatay Formation

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GroupFossilsNotes
MammalsChilcacetus cavirhinus,Huaridelphis raimondii,Incacetus broggii,Inticetus vertizi,Macrosqualodelphis ukupachai,Notocetus vanbenedeni,cf. Kentriodon sp.,Cetotheriidae indet.,Eurhinodelphinidae indet.,Mysticeti indet.,Odontoceti indet.,Pinnipedia indet.,Physeteroidea indet.,Squalodelphinidae indet.
BirdsPalaeospheniscus sp.
ReptilesTestudines indet.
FishCarcharhinus cf. brachurus,Carcharodon hastalis,Carcharodon subauriculatus,Hemipristis cf. serra,Isurus desori

Otuma Formation

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GroupFossilsNotes
MammalsCynthiacetus peruvianus,Basilosauridae indet.
BirdsIcadyptes salasi,Inkayacu paracasensis,Spheniscidae indet.
FishEngraulis sp.,Sardinops sp.

Paracas Formation

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GroupFossilsNotes
MammalsOcucajea picklingi,Supayacetus muizoni,Basilosauridae indet.,Mystacodon selenensis,Peregocetus pacificus,Perucetus colossus
BirdsPerudyptes devriesi
FishPristis sp.,Myliobatis sp.,Clupeiformes sp.

See also

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Notes and references

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Notes

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  1. ^later publications give a younger top date
  2. ^Based on "DeVries (1998) as presented by Leónet al. (2007)"[4]
  3. ^SeeSALMA Bibliography for sources

References

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  1. ^Solís Mundaca, 2018, p.1
  2. ^abcdefgDunbar et al., 1990
  3. ^León et al. 2007, p. 7.
  4. ^León et al. 2007, p. 44.
  5. ^abcdDeVries 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. ^abcdDeVries, 1998
  10. ^abcdeMacharé et al., 1988
  11. ^abUllujaya atFossilworks.org
  12. ^Ullujaya 2 atFossilworks.org
  13. ^abSanta Rosa atFossilworks.org
  14. ^abZamaca atFossilworks.org
  15. ^Cerro Buque M2 atFossilworks.org
  16. ^Cerro Buque M8 atFossilworks.org
  17. ^Paracas Bay atFossilworks.org
  18. ^Archaeocete Valley, Otuma, AV-10 atFossilworks.org
  19. ^Ullujaya Valley atFossilworks.org
  20. ^Bajada del Diablo atFossilworks.org
  21. ^abParacas Reserve atFossilworks.org
  22. ^Archaeocete Valley atFossilworks.org
  23. ^Archaeocete Valley, Paracas, AV-17 atFossilworks.org
  24. ^Archaeocete Valley, Paracas, AV-19 atFossilworks.org
  25. ^abLambert et al., 2017
  26. ^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.Bibcode:2019CBio...29E1352L.doi:10.1016/j.cub.2019.02.050.hdl:11581/425570.ISSN 0960-9822.PMID 30955933.
  27. ^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.620 (7975):824–829.Bibcode:2023Natur.620..824B.doi:10.1038/s41586-023-06381-1.hdl:10281/434998.ISSN 1476-4687.PMID 37532931.
  28. ^Quebrada Perdida atFossilworks.org
  29. ^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 (5): 91.doi:10.4267/2042/70759.hdl:20.500.12544/2621.ISSN 1634-0744.

Bibliography

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Stratigraphy

Geology publications

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Paleontology publications

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Further reading

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Chilcatay Formation
Paracas Group
Pisco Formation
Sedimentary basins of Peru
Onshore
Amazon
Andean
Littoral
Pisco Basin is located in Peru
Offshore
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