Chasicoan

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title: "Chasicoan" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["chasicoan", "miocene-south-america", "neogene-argentina"] topic_path: "geography/argentina" source: "https://en.wikipedia.org/wiki/Chasicoan" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

The Chasicoan ( or ) age is a period of geologic time from 10–9 Ma within the Late Miocene epoch of the Neogene, used more specifically within the SALMA classification in South America. It follows the Mayoan and precedes the Huayquerian age.

Isotopic analysis of the fauna at Arroyo Chasicó, the type locality of the Chasicoan Stage/Age, indicates a paleoenvironment characterized by woodland and wooded C3 grassland, with some taxa showing mixed C3–C4 diets.

Etymology

The Chasicoan is named after the Arroyo Chasicó Formation of the Colorado Basin in northeastern Argentina.

Formations

| relief = 1 | width = 300 | caption = Locations of Chasicoan formations | places = | lat_deg = -27.1 | lon_deg = -70.9 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Bahía Inglesa Formation | lat_deg = -11.5 | lon_deg = -69.5 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Caujarao Formation | lat_deg = -37.4 | lon_deg = -65.5 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Cerro Azul Formation | lat_deg = -30.339167 | lon_deg = -71.534167 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Coquimbo Formation | lat_deg = -31.1 | lon_deg = -68.5 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Loma de las Tapias Formation | lat_deg = -12.6 | lon_deg = -70.1 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Madre de Dios Formation | lat_deg = -17.1 | lon_deg = -69.2 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Mauri Formation | lat_deg = -34.0 | lon_deg = -71.8 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Navidad Formation | lat_deg = -33.7 | lon_deg = -59.3 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Paraná Formation | lat_deg = -7.4 | lon_deg = -75.0 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Pebas Formation | lat_deg = -15.7 | lon_deg = -74.5 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Pisco Formation | lat_deg = -42.2 | lon_deg = -64.3 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Puerto Madryn Formation | lat_deg = 11.2 | lon_deg = -70.0 | mark = Yellow ffff00 pog.svg | marksize = 10 | link = Urumaco Formation | lat_deg = -38.6 | lon_deg = -63.0 | mark = Yellow ffff00 pog.svg | marksize = 14 | link = Arroyo Chasicó Formation ::data[format=table] | Formation bold is type | Country | Basin | Notes | |---|---|---|---| | Arroyo Chasicó Formation | | Colorado Basin | | | Bahía Inglesa Formation | | Caldera Basin | | | Caujarao Formation | | Falcón Basin | | | Cerro Azul Formation | | Colorado Basin | | | Coquimbo Formation | | Tongoy Bay | | | Loma de Las Tapias Formation | | Tulum Valley | | | Madre de Dios Formation | | Madre de Dios Basin | | | Mauri Formation | | Altiplano Basin | | | Navidad Formation | | Chilean Coast Range | | | Puerto Madryn Formation | | Valdés Basin | | | Paraná Formation | | Paraná Basin | | | Pebas Formation |

| Amazon Basin | | | Pisco Formation | | Pisco Basin | | | Urumaco Formation | | Falcón Basin | | ::

Fossil content

::data[format=table]

GroupFossilsFormationNotes
MammalsCardiatherium chasicoense, Cardiomys leufuensis, Chasicobradys intermedius, Chasicostylus castroi, Chasicotatus ameghinoi, Epipeltephilus kanti, Lagostomus telenkechanum, Lycopsis viverensis, Paedotherium minor, Pisanodon nazari, Protomegalonyx chasicoensis, Pseudolycopsis cabrerai, Vetelia perforata, Kraglievichia sp., Orthomyctera sp., ?Parodimys sp., Proeuphractus sp., ?Tetrastylus sp., Typotheriopsis sp., Hegetotheriinae indet., Hoplophorini indet., Palaehoplophorini indet., Plohophorini indet., Proterotheriinae indet.[Arroyo
Chasicó](arroyo-chasico-formation)
Chasichimys bonaerense, Chasicotatus ameghinoi, Macrochorobates scalabrinii[Cerro
Azul](cerro-azul-formation)
Cardiatherium chasicoense, Contrerascynus borhyaenoides[Loma de
las Tapias](loma-de-las-tapias-formation)
Notiomastodon sp.[Madre de
Dios](madre-de-dios-formation)
Bolivartherium urumaquensis, Bounodus enigmaticus, Ischyrorhynchus cf. vanbenedeni, Pseudoprepotherium urumaquensis, Urumaquia robusta, Gyrinodon sp., Neoepiblema sp., Potamarchus sp., Ribodon sp., Saurocetes sp.Urumaco
BirdsPsilopterus colzecus[Arroyo
Chasicó](arroyo-chasico-formation)
Leptoptilos patagonicusPuerto Madryn
Reptiles &
amphibiansCarlesia cf. pendolai, Anura indet., Testudines indet.[Arroyo
Chasicó](arroyo-chasico-formation)
Bairdemys venezuelensis, Caiman brevirostris, C. wannlangstoni, Charactosuchus mendesi, Globidentosuchus brachyrostris, Gryposuchus croizati, G. jessei, G. cf. pachakamue, Hesperogavialis cruxenti, Ikanogavialis gameroi, Melanosuchus fisheri, Mourasuchus arendsi, Purussaurus mirandai, Boinae indet.Urumaco
FishesMegalodon, Hemipristis serra, Carcharhinus sp., Galeocerdo sp., Rhinoptera sp., Sphyrna sp.Caujarao
Ariidae indet., Carcharhinidae indet., Dasyatidae indet., Hemigaleidae indet., Heterodontidae indet., Lamnidae indet., Myliobatidae indet., Odontaspididae indet., Otodontidae indet., Physeteroidea indet., Rajidae indet., Sciaenidae indet., Sparidae indet., Sphyrnidae indet., Squatinidae indet.Paraná
Megalodon, Arius couma, A. dowii, A. herzbergii, A. kessleri, A. quadriscutis, A. rugispinis, Bagre marinus, Carcharhinus caquetius, Epinephelus itajara, Galeocerdo cuvier, Hemipristis serra, Larimus henrii, L. steurbautti, Micropogonias coatesi, Phractocephalus nassi, Pristis pectinata, Carcharhinus sp., Cynoscion sp., Dasyatis sp., Equetus sp., Haemulon sp., Nebris sp., Rhinoptera sp., Sphyrna sp.Urumaco
::

References

Bibliography

;Arroyo Chasicó Formation

;Bahía Inglesa Formation

  • {{citation |last1=Achurra |first1=L.E. |last2=Lacassie |first2=J.P. |last3=Le Roux |first3=J.P. |last4=Marquadt |first4=C. |last5=Belmar |first5=M. |last6=Ruiz Del Solar |first6=J. |last7=Ishman |first7=S.E. |year=2009 |title=Manganese nodules in the Miocene Bahía Inglesa Formation, north-central Chile: Petrography, geochemistry, genesis and palaeoceanographic significance |url=http://vision.die.uchile.cl/filesJavier/SG2009.pdf |journal=Sedimentary Geology |volume=217 |issue=1–4 |pages=128–139 |doi=10.1016/j.sedgeo.2009.03.016 |bibcode=2009SedG..217..128A |access-date=2017-08-15}}
  • {{citation |last1=Achurra |first1=L. |last2=Marquadt |first2=C. |last3=Lacassie |first3=J.P. |last4=Le Roux |first4=J.P. |year=2003 |title=Nódulos de Mn de la Formación Bahía Inglesa: geoquímica, génesis e implicancias paleoambientales |url=http://biblioteca.sernageomin.cl/opac/DataFiles/AchurraL_et_al.pdf |publisher=X Congreso Geológico Chileno |pages=1–10 |archive-url=https://web.archive.org/web/20171026002317/http://biblioteca.sernageomin.cl/opac/DataFiles/AchurraL_et_al.pdf |access-date=2017-08-15|archive-date=2017-10-26 }}
  • {{citation |last1=Acosta Hospitaleche |first1=Carolina |last2=Canto |first2=Jhoann |year=2005 |title=Primer registro de cráneos asignados a Palaeospheniscus (Aves, Spheniscidae) procedentes de la Formación Bahía Inglesa (Mioceno Medio-Tardío), Chile |url=http://www.scielo.cl/pdf/rchnat/v78n3/art10.pdf |journal=Revista Chilena de Historia Natural |volume=78 |pages=489–495 |access-date=2017-08-15}}
  • {{citation |last1=Le Roux |first1=Jacobus P. |last2=Achurra |first2=Luciano |last3=Henríquez |first3=Álvaro |last4=Carreño |first4=Catalina |last5=Rivera |first5=Huber |last6=Suárez |first6=Mario E. |last7=Ishman |first7=Scott E.|author8-link=Nicholas Pyenson |last8=Pyenson |first8=Nicholas D. |last9=Gutstein |first9=Carolina S. |year=2016 |title=Oroclinal bending of the Juan Fernández Ridge suggested by geohistory analysis of the Bahía Inglesa Formation, north-central Chile |url=http://repositorio.uchile.cl/bitstream/handle/2250/139375/Oroclinal-bending-of-the-Juan-Fernandez-Ridge.pdf?sequence=1&isAllowed=y |journal=Sedimentary Geology |volume=333 |pages=32–49 |doi=10.1016/j.sedgeo.2015.12.003 |bibcode=2016SedG..333...32L |access-date=2017-08-15}}
  • {{citation |last1=Staig |first1=Felipe |last2=Hernández |first2=Sebastián |last3=López |first3=Patricio |last4=Villafaña |first4=Jaime A. |last5=Varas |first5=Cristian |last6=Soto |first6=Luis Patricio |last7=Carrillo Briceño |first7=Jorge D. |year=2015 |title=Late Neogene Elasmobranch fauna from the Coquimbo Formation, Chile |url=http://repositorio.uchile.cl/bitstream/handle/2250/136058/Late-neogene-elasmobranch-fauna.pdf;sequence=1 |journal=Revista Brasileira de Paleontologia |volume=18 |issue=2 |pages=261–272 |doi=10.4072/rbp.2015.2.07 |access-date=2017-08-15|doi-access=free |bibcode=2015RvBrP..18..261S }}
  • {{citation |last1=Valenzuela Toro |first1=Ana |last2=Gutstein |first2=Carolina S. |year= |title=Mamíferos marinos fósiles (excepto Cetacea) de Formación Bahía Inglesa: Registro, implicancias paleoambientales y perspectivas de estudio |url=http://biblioteca.sernageomin.cl/opac/DataFiles/14127_pp_770_772.pdf |journal= |volume= |pages=770–772 |archive-url=https://web.archive.org/web/20171026110512/http://biblioteca.sernageomin.cl/opac/DataFiles/14127_pp_770_772.pdf |access-date=2017-08-15|archive-date=2017-10-26 }}

;Caujarao Formation

;Cerro Azul Formation

;Coquimbo Formation

;Loma de Las Tapias Formation

;Madre de Dios Formation

;Mauri Formation

  • {{citation |last1=Marshall |first1=Larry G. |last2=Sempere |first2=Thierry |year=1991 |title=The Eocene to Pleistocene vertebrates of Bolivia and their stratigraphic context: A review |url=https://www.researchgate.net/publication/32979728 |journal=Revista técnica de YPFB |volume=12 |pages=631–652 |access-date=2017-08-15}}

;Navidad Formation

;Palo Pintado Formation

;Paraná Formation

  • {{citation |last=Martín Pérez |first=Leandro |year=2013 |title=Sistemática, tafonomía y paleoecología de los invertebrados de la Formación Paraná (Mioceno), Provincia de Entre Ríos, Argentina (PhD thesis) |url=http://naturalis.fcnym.unlp.edu.ar/repositorio/_documentos/tesis/tesis_1255.pdf |publisher=Universidad Nacional de La Plata |pages=1–398 |access-date=2017-08-15}}

;Pebas Formation

  • {{citation |last1=Wesselingh |first1=F.P. |last2=Hoorn |first2=M.C. |last3=Guerrero |first3=J. |last4=Räsänen |first4=M.E. |last5=Romero Pittmann |first5=L. |last6=Salo |first6=J. |year=2006 |title=The stratigraphy and regional structure of Miocene deposits in western Amazonia (Peru, Colombia and Brazil), with implications for late Neogene landscape evolution |url=http://www.repository.naturalis.nl/document/41347 |journal=Scripta Geologica |volume=133 |pages=291–322 |access-date=2017-08-15}}

;Pisco Formation

;Puerto Madryn Formation

;Urumaco Formation

References

  1. [http://www.fossilworks.org/cgi-bin/bridge.pl?a=displayInterval&interval_no=724 Chasicoan] at [[Fossilworks]].org
  2. (2024). "Paleoenvironment and paleoecology associated with the early phases of the Great American Biotic Interchange based on stable isotope analysis of fossil mammals and new U–Pb ages from the Pampas of Argentina". Palaeogeography, Palaeoclimatology, Palaeoecology.
  3. Pérez, 2012, p.11
  4. Le Roux et al., 2006, p.46
  5. Quijano Ballesteros, 2005, p.19
  6. Goin et al., 2000, p.101
  7. Verzi et al., 2008, p.146
  8. Le Roux et al., 2006, p.49
  9. Deschamps et al., 2009, p.296
  10. Romero et al., 1998, p.60
  11. Marshall & Sempere, 1991, p.636
  12. Finger et al., 2007, p.13
  13. Noriega & Cladera, 2008, p.594
  14. Martín Pérez, 2013, p.51
  15. Antoine et al., 2016, p.56
  16. Wesselingh et al., 2006, p.304
  17. Brand et al., 2011
  18. Linares, 2004, p.16
  19. Pérez et al., 2018
  20. Rasia & Candela, 2016
  21. González Ruiz et al., 2012
  22. [https://paleobiodb.org/classic/displayCollResults?collection_no=142339 Ribera del Arroyo Chasicó] at [[Fossilworks]].org
  23. [https://paleobiodb.org/classic/displayCollResults?collection_no=140913 Barrancas del Arroyo Chasicó] at [[Fossilworks]].org
  24. [https://paleobiodb.org/classic/displayCollResults?collection_no=168397 Las Barrancas] at [[Fossilworks]].org
  25. [https://paleobiodb.org/classic/displayCollResults?collection_no=79180 Arroyo Chasicó] at [[Fossilworks]].org
  26. [https://paleobiodb.org/classic/displayCollResults?collection_no=152063 Cerro La Bota] at [[Fossilworks]].org
  27. Mones, 2014
  28. [https://paleobiodb.org/classic/displayCollResults?collection_no=146533 Quebrada Ullum] at [[Fossilworks]].org
  29. [https://paleobiodb.org/classic/displayCollResults?collection_no=167887 Loma de Las Tapias Localidad Nº 4] at [[Fossilworks]].org
  30. [https://paleobiodb.org/classic/displayCollResults?collection_no=144515 Aurinsa] at [[Fossilworks]].org
  31. [https://paleobiodb.org/classic/displayCollResults?collection_no=92751 Urumaco Formation] at [[Fossilworks]].org
  32. [https://paleobiodb.org/classic/displayCollResults?collection_no=146421 Urumaco, Biozona 2 Loc 01-FU] at [[Fossilworks]].org
  33. [https://paleobiodb.org/classic/displayCollResults?collection_no=144849 Urumaco] at [[Fossilworks]].org
  34. [https://paleobiodb.org/classic/displayCollResults?collection_no=146427 Urumaco, Biozona 2 Loc 46-FU] at [[Fossilworks]].org
  35. [https://paleobiodb.org/classic/displayCollResults?collection_no=145364 Tío Gregorio - brown shales] at [[Fossilworks]].org
  36. [https://paleobiodb.org/classic/displayCollResults?collection_no=136776 Tío Gregorio] at [[Fossilworks]].org
  37. [https://paleobiodb.org/classic/displayCollResults?collection_no=147465 Northwest of San Rafael] at [[Fossilworks]].org
  38. [https://paleobiodb.org/classic/displayCollResults?collection_no=85116 Punta Buenos Aires] at [[Fossilworks]].org

  39. [https://paleobiodb.org/classic/displayCollResults?collection_no=136777 El Hatillo] at [[Fossilworks]].org
  40. [https://paleobiodb.org/classic/displayCollResults?collection_no=63520 Corralito Locality] at [[Fossilworks]].org
  41. [https://paleobiodb.org/classic/displayCollResults?collection_no=147464 Domo de Agua Blanca] at [[Fossilworks]].org
  42. [https://paleobiodb.org/classic/displayCollResults?collection_no=144595 Cerro Jose la Paz site, El Picache] at [[Fossilworks]].org
  43. [https://paleobiodb.org/classic/displayCollResults?collection_no=162677 Caujarao] at [[Fossilworks]].org
  44. [https://paleobiodb.org/classic/displayCollResults?collection_no=128628 Cantera del Puerto Viejo] at [[Fossilworks]].org
  45. Carrillo Briceño et al., 2015

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chasicoanmiocene-south-americaneogene-argentina