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Chasicoan
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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.[1]

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.[2]

Etymology

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

Formations

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Chasicoan is located in South America
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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

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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

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