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

Chasicoan is located in South America
Locations of Chasicoan formations
Formation bold is typeCountryBasinNotes
Arroyo Chasicó FormationArgentinaColorado Basin
Bahía Inglesa FormationChileCaldera Basin
Caujarao FormationVenezuelaFalcón Basin
Cerro Azul FormationArgentinaColorado Basin
Coquimbo FormationChileTongoy Bay
Loma de Las Tapias FormationArgentinaTulum Valley
Madre de Dios FormationPeruMadre de Dios Basin
Mauri FormationBoliviaAltiplano Basin
Navidad FormationChileChilean Coast Range
Puerto Madryn FormationArgentinaValdés Basin
Paraná FormationArgentinaParaná Basin
Pebas FormationBrazil Colombia Ecuador PeruAmazon Basin
Pisco FormationPeruPisco Basin
Urumaco FormationVenezuelaFalcón Basin

Fossil content

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
Chasichimys bonaerense, Chasicotatus ameghinoi, Macrochorobates scalabriniiCerro Azul
Cardiatherium chasicoense, Contrerascynus borhyaenoidesLoma 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
BirdsPsilopterus colzecusArroyo Chasicó
Leptoptilos patagonicusPuerto Madryn
Reptiles & amphibiansCarlesia 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
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

Bibliography

Arroyo Chasicó Formation

Bahía Inglesa Formation

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Caujarao Formation

Cerro Azul Formation

Coquimbo Formation

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Loma de Las Tapias Formation

Madre de Dios Formation

Mauri Formation

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Navidad Formation

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Palo Pintado Formation

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Paraná Formation

Pebas Formation

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Pisco Formation

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Puerto Madryn Formation

Urumaco Formation

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