Chasicoan

The Chasicoan (Spanish: Chasiquense or Spanish: Chasicoense) 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

Locations of Chasicoan formations

Formation bold is type	Country	Basin	Notes
Arroyo Chasicó Formation	Argentina	Colorado Basin
Bahía Inglesa Formation	Chile	Caldera Basin
Caujarao Formation	Venezuela	Falcón Basin
Cerro Azul Formation	Argentina	Colorado Basin
Coquimbo Formation	Chile	Tongoy Bay
Loma de Las Tapias Formation	Argentina	Tulum Valley
Madre de Dios Formation	Peru	Madre de Dios Basin
Mauri Formation	Bolivia	Altiplano Basin
Navidad Formation	Chile	Chilean Coast Range
Puerto Madryn Formation	Argentina	Valdés Basin
Paraná Formation	Argentina	Paraná Basin
Pebas Formation	Brazil Colombia Ecuador Peru	Amazon Basin
Pisco Formation	Peru	Pisco Basin
Urumaco Formation	Venezuela	Falcón Basin

Fossil content

Group	Fossils	Formation	Notes
Mammals	Cardiatherium 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
	Chasichimys bonaerense, Chasicotatus ameghinoi, Macrochorobates scalabrinii	Cerro Azul
	Cardiatherium chasicoense, Contrerascynus borhyaenoides	Loma de las Tapias
	Notiomastodon sp.	Madre de Dios
	Bolivartherium urumaquensis, Bounodus enigmaticus, Ischyrorhynchus cf. vanbenedeni, Pseudoprepotherium urumaquensis, Urumaquia robusta, Gyrinodon sp., Neoepiblema sp., Potamarchus sp., Ribodon sp., Saurocetes sp.	Urumaco
Birds	Psilopterus colzecus	Arroyo Chasicó
	Leptoptilos patagonicus	Puerto Madryn
Reptiles & amphibians	Carlesia cf. pendolai, Anura indet., Testudines indet.	Arroyo Chasicó
	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
Fishes	Megalodon, 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

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Bahía Inglesa Formation

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Caujarao Formation

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Cerro Azul Formation

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Coquimbo Formation

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Loma de Las Tapias Formation

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Madre de Dios Formation

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Mauri Formation

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Navidad Formation

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Palo Pintado Formation

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Paraná Formation

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Pebas Formation

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Pisco Formation

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• Stucchi, Marcelo; Emslie, Steven D.; Varas Malca, Rafael M.; Urbina Schmitt, Mario (2015a), "A new late Miocene condor (Aves, Cathartidae) from Peru and the origin of South American condors", Journal of Vertebrate Paleontology, 35 (5) e972507, Bibcode:2015JVPal..35E2507S, doi:10.1080/02724634.2015.972507, retrieved 2019-02-13
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Puerto Madryn Formation

• Noriega, J.I.; Cladera, G. (2008), "First record of an extinct marabou stork in the Neogene of South America" (PDF), Acta Palaeontologica Polonica, 53 (4): 593–600, Bibcode:2008AcPaP..53..593I, doi:10.4202/app.2008.0404, retrieved 2019-03-06

Urumaco Formation

• Carrillo Briceño, Jorge D.; Maxwell, Erin; Aguilera, Órangel A.; Sánchez, Rodolfo; Sánchez Villagra, Marcelo R. (2015), "Sawfishes and Other Elasmobranch Assemblages from the Mio-Pliocene of the South Caribbean (Urumaco Sequence, Northwestern Venezuela)", PLoS ONE, 10 (10) e0139230, Bibcode:2015PLoSO..1039230C, doi:10.1371/journal.pone.0139230, PMC 4619466, PMID 26488163
• Linares, Omar J (2004), "Bioestratigrafía de la fauna de mamíferos de las formaciones Socorro, Urumaco y Codore (Mioceno Medio-Plioceno Temprano) de la región de Urumaco, Falcón, Venezuela" (PDF), Paleobiología Neotropical, 1: 1–26, retrieved 2017-08-15
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• Rincón, Ascanio D.; Solórzano, Andrés; McDonald, H. Gregory; Montellano Ballesteros, Marisol (2018), "Two new megalonychid sloths (Mammalia: Xenarthra) from the Urumaco Formation (late Miocene), and their phylogenetic affinities", Journal of Systematic Palaeontology, 17 (5): 409–421, doi:10.1080/14772019.2018.1427639, retrieved 2019-02-11
• Rincón, Ascanio D.; McDonald, H. Gregory; Solórzano, Andrés; Núñez Flores, Mónica; Ruiz Ramoni, Damián (2015), "A new enigmatic Late Miocene mylodontoid sloth from northern South America", Royal Society Open Science, 2 (2) 140256, Bibcode:2015RSOS....240256R, doi:10.1098/rsos.140256, PMC 4448802, PMID 26064594, retrieved 2019-02-13