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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
Chasicoan
Geologic age of the late Miocene
Clarendonian and lower Hemphillian North American land mammal ages and the upper Chasicoan and lower Huayquerian South American land mammal ages. The Tortonian was
Tortonian
Period of geologic time (9.0–6.8 Ma)
used more specifically within the SALMA classification. It follows the Chasicoan and precedes the Montehermosan age. The age is named after the Huayquerías
Huayquerian
First epoch of the Neogene Period
Baodean Baringian Waitean Huayquerian Sugutan Tortonian Bahean Clarendonian Chasicoan Vallesian (MN 9-10) Mayoan Tugenian Astaracian (MN 6-8) Tunggurian Serravallian
Miocene
Extinct family of mammals
mammals known from the Late Eocene (Tinguirirican) through Late Miocene (Chasicoan) of Argentina and Chile in South America. McKenna, Malcolm C., and Bell
Homalodotheriidae
Extinct order of mammals
SALMA) Genus Chasicostylus Chasicostylus castroi (early late Miocene, Chasicoan SALMA) Genus Cladosictis Cladosictis centralis (early Miocene, Colhuehuapian
Sparassodonta
Extinct genus of reptiles
Mourasuchus is an extinct genus of giant, aberrant caiman from the Miocene of South America. Its skull has been described as duck-like, being broad, flat
Mourasuchus
Extinct genus of litopterns
is only known from fragmentary remains. Cullinia levis is known from Chasicoan remains found in the Arroyo Chasicó Formation of Argentina, and remains
Cullinia
Extinct genus of birds
Buenos Aires Province of Argentina and are dated to the Late Miocene (Chasicoan). When P. bachmanni was originally described in 1891, few other birds
Psilopterus
Extinct family of flightless birds
– Middle Oligocene (Deseadan) Santa Cruz Formation and Late Miocene (Chasicoan) Arroyo Chasicó Formation of southern and eastern Argentina respectively
Phorusrhacidae
Family of South American cingulates (armadillos)
Peltephilidae (Mammalia: Xenarthra: Cingulata) from the late Miocene (Chasicoan SALMA) of Argentina". Zootaxa. 3359. doi:10.11646/zootaxa.3359.1.5. hdl:11336/196599
Peltephilidae
Extinct genus of reptiles
Purussaurus is a genus of extinct giant caimans that lived in the Americas during the Miocene epoch, from the Friasian to the Huayquerian in the SALMA
Purussaurus
Extinct genus of notoungulates
sediments in which the animal was discovered dates to 10 to 9 million years (Chasicoan). It is known only from the type species, C. rothi. Its weight was approximately
Chasicotherium
Extinct genus of birds
Waipara River mouth (Waiauan), Canterbury, New Zealand Pisco Formation (Chasicoan-Huayquerian), Peru Costa da Caparica or Fonte de Pipa, Tagus Basin, Portugal
Pelagornis
Geologic formation in Bolivia
The Yecua Formation is a geological Formation in what is now Bolivia. Studies suggest that the Yecua Formation preserves a coastal setting with humid to
Yecua_Formation
Extinct genus of rodent
2024). "Dinomyid (Rodentia, Caviomorpha) diversity from the Late Miocene (Chasicoan Stage/Age) Cerro Azul Formation at the classical Arroyo Chasicó locality
Bondesiomys
Extinct genus of sparassodont mammals
Dimartinia Temporal range: Late Miocene (Chasicoan), 9.7–8.7 Ma PreꞒ Ꞓ O S D C P T J K Pg N Holotype specimen Scientific classification Kingdom: Animalia
Dimartinia
(2024). "Dinomyid (Rodentia, Caviomorpha) diversity from the Late Miocene (Chasicoan Stage/Age) Cerro Azul Formation at the classical Arroyo Chasicó locality
2024_in_paleomammalogy
Extinct genus of mammals belonging to the armadillo order of xenarthrans
genus. The holotype material was also reevaluated as belonging to the Chasicoan period. The genus name, Kelenkura was constructed on the words këlen,
Kelenkura
is C. wessechresti. Dimartinia Gen. et sp. nov Suarez et al. Miocene (Chasicoan) Cerro Azul Formation Argentina A member of Sparassodonta. The type species
2025_in_paleomammalogy
Extinct genus of rodents
Telicomys is an extinct genus of rodent from the Solimões Formation, Brazil, South America. This rodent weighed approximately 200–500 kg (440–1,100 lb)
Telicomys
Extinct genus of mammals
indicates that they are of the Late Miocene and would correspond to the Chasicoan mammal-age. The uncovered remains include the holotype specimen MNHN ACH1
Hoffstetterius
Geologic formation in Peru
The Pisco Formation is a geologic formation located in Peru, on the southern coastal desert of Ica and Arequipa. The approximately 640 metres (2,100 ft)
Pisco_Formation
Extinct genus of mammals
Surameryx is an extinct genus of herbivorous artiodactyls originally described as belonging to the extinct family Palaeomerycidae. A single species, S
Surameryx
Extinct genus of notoungulates
Toxodon (from Ancient Greek τόξον (tóxon), meaning "bow", and ὀδούς (odoús), meaning "tooth", in reference to the curvature of the teeth) is an extinct
Toxodon
Pleistocene San Gregorio Formation Chapadmalalan-Uquian Caujarao Formation Chasicoan-Late Pleistocene Codore Formation Montehermosan-Early Pleistocene Cabo
List of fossiliferous stratigraphic units in Venezuela
List_of_fossiliferous_stratigraphic_units_in_Venezuela
Extinct genus of gavialoid crocodilian
Gryposuchus fossil localities Colloncuran Laventan Chasicoan Huayquerian
Gryposuchus
Extinct genus of mammals
including Mesotherium and Pseudotypotherium. Its fossils are known from the Chasicoan and the Huayquerian periods, notably among Late Miocene rocks from the
Typotheriopsis
Pliocene (Colloncuran-Chapadmalalan) Contamana Madre de Dios Formation Chasicoan-Huayquerian Miramar Formation Late Miocene (Huayquerian) Tumbes Formation
List of fossiliferous stratigraphic units in Peru
List_of_fossiliferous_stratigraphic_units_in_Peru
Genus of sharks
Brazil Aquitanian Trent North Carolina Early Miocene Filakovo Slovakia Chasicoan †C. caquetius Carrillo Briceño et al. 2015 Urumaco Venezuela Santacrucian
Carcharhinus
classification in South America. It follows the Laventan and precedes the Chasicoan age. The age is named after the Río Mayo Formation in the Golfo San Jorge
Mayoan
Genus of marsupials
Thylamys is a genus of opossums in the family Didelphidae. The premaxillae are rounded rather than pointed. The females lack a pouch. The females' nipples
Thylamys
Genus of mammals
Ribodon is an extinct genus of manatee that lived around South America (Ituzaingó Formation, then described as Entrerriana Formation, Argentina, Solimões
Ribodon
Extinct genus of ground sloths
Lestobradys is an extinct genus of ground sloth (family Mylodontidae), which existed in Uruguay during the Late Miocene period; Huayquerian in the South
Lestobradys
Extinct family of rodents
The Neoepiblemidae are an extinct family of hystricognath rodents from South America. The genera Dabbenea and Perumys are now included in Phoberomys. The
Neoepiblemidae
Argentinian sedimentary basin
dating to the Late Miocene. The Arroyo Chasicó Formation defines the Chasicoan South American land mammal age and contains a rich mammal and other vertebrate
Colorado_Basin,_Argentina
Extinct genus of mammal
Trigodon is an extinct genus of the family Toxodontidae, a large-bodied notoungulate which inhabited South America during the Late Miocene to Early Pliocene
Trigodon
1913 Chapadmalalan 4.0 3.0 age Pliocene South America Kraglievich, 1930 Chasicoan 10.0 9.0 age Miocene South America Cabrera & Kraglievich, 1928 Chatauquan
List_of_geochronologic_names
Possibly marine ground sloth from Venezuela
the Middle Miocene to Early Pliocene, the Urumaco Formation from the Chasicoan to the Huayquerian according to the SALMA classification system. This
Eionaletherium
Extinct genus of mammals
Adinotherium (meaning "not terrible beast") is an extinct genus of toxodontid, large bodied hoofed ungulates which inhabited South America during the Middle
Adinotherium
Extinct genus of notoungulates
H.; Visconti, G.; Folguera, A.; Schmidt, G. I. (1 November 2019). "A Chasicoan (late Miocene) vertebrate assemblage from Cerro Azul Formation, central
Protypotherium
Extinct genus of ground sloths
Hapalops is an extinct genus of ground sloth from the Early to Late Miocene of Brazil (Solimões Formation), Bolivia (Honda Group), Colombia (Honda Group)
Hapalops
Geological formation in Brazil, Colombia, Ecuador and Peru
The Pebas Formation is a lithostratigraphic unit of Miocene age, found in western Amazonia. The formation extends over 1,000,000 square kilometres (390
Pebas_Formation
Huayquerian Jujuy Piquete Huayquerian Guanaco Sonso Montehermosan Palo Pintado Chasicoan Laventan Angastaco Friasian Friasian Metán Jesús María Friasian Anta Early
Salta_Basin
Extinct genus of reptiles
Charactosuchus is an extinct genus of crocodilian. It was assigned to the family Crocodylidae in 1988. Specimens have been found in Colombia, Brazil, Jamaica
Charactosuchus
Extinct genus of crocodylians
Sacacosuchus is an extinct monospecific genus of marine gavialid that lived along the coast of the south-east Pacific from approximately 19 to 6.3 million
Sacacosuchus
Geological group in the Colombian Andes
Lujanian Ensenadan Marplatan Chapadmalalan Montehermosan Huayquerian Chasicoan Mayoan Laventan Colloncuran Friasian Santacrucian Colhuehuapian Deseadan
Honda_Group,_Colombia
Extinct family of seabirds
almost-complete fossilized skull of a presumed Odontopteryx from around the Chasicoan-Huayquerian boundary c. 9 million years ago (Ma) was unveiled in Lima
Pelagornithidae
Geologic formation in Panama
American land mammal age for the estimated age of the Arajuela Formation is Chasicoan. The Alajuela Formation is an important Late Miocene unit, as it represents
Alajuela_Formation
Extinct genus of new world monkeys
Solimoea acrensis is a prehistoric ateline monkey from the Late Miocene Solimões Formation of Brazil. It is the only known species of the genus Solimoea
Solimoea
Geologic formation in Ecuador
The Letrero Formation is a Late Miocene (Mayoan to Montehermosan in the SALMA classification) geologic formation in south-central Ecuador. The formation
Letrero_Formation
Extinct genus of mammals
Epipeltephilus is the last known member of its family, becoming extinct during the Chasicoan period. It was found in the Rio Mayo Formation and the Arroyo Chasicó
Epipeltephilus
Extinct species of reptile
Caiman wannlangstoni is an extinct species of caiman that lived in what is now the Amazon Basin and surrounding areas during the Middle and Late Miocene
Caiman_wannlangstoni
Extinct genus of reptiles
Ikanogavialis is an extinct genus of gavialid crocodilian. Fossils have been found in the Urumaco Formation in Urumaco, Venezuela and the Solimões Formation
Ikanogavialis
Geologic formation in Venezuela
The Urumaco Formation is a formation in Venezuela that includes deposits from the Late Miocene. It is the site of several "giant forms": the turtles, crocodiles
Urumaco_Formation
Peltephilidae (Mammalia: Xenarthra: Cingulata) from the late Miocene (Chasicoan SALMA) of Argentina". Zootaxa. 3359 (1): 55–64. doi:10.11646/zootaxa.3359
List of organisms named after famous people (born before 1800)
List_of_organisms_named_after_famous_people_(born_before_1800)
Extinct genus of astrapothere
Xenastrapotherium is an extinct genus of astrapothere, a type of hoofed herbivorous mammal, native to South America, which lived in the Middle to Late
Xenastrapotherium
Extinct genus of rodents
Perimys is an extinct genus of neoepiblemid rodent that lived from the Early to Late Miocene in what is now South America. Fossils have been found in the
Perimys
Extinct monotypic genus of monkeys
Acrecebus is a prehistoric cebid monkey from the Late Miocene Solimões Formation of Acre State, Brazil and Bolivia. The only species known is A. fraileyi
Acrecebus
Extinct marsupial-like mammal
Lycopsis Temporal range: Mid-Late Miocene (Santacrucian-Chasicoan) ~16.3–9.0 Ma PreꞒ Ꞓ O S D C P T J K Pg N Fossil of L. longirostrus at the American
Lycopsis
Extinct genus of mammals
Piscobalaena is an extinct genus of cetaceans, which lived from the Middle to Late Miocene epochs (about 11.6 to 5.3 million years ago) in Peru and Florida
Piscobalaena
Geologic formation in Ecuador
The Angostura Formation is a Late Miocene (Mayoan to Montehermosan in the SALMA classification) geologic formation of the Borbón Basin in northwestern
Angostura_Formation,_Ecuador
Superfamily of snakes
de serpents. Annales de Paléontologie (Vertébrés) 63(2):161-190 indet. ChasicoanMayoanLaventan Solimões Solimões Brazil Described from Talismã, upper
Colubroidea
Extinct genus of mammals
Paratrigodon are known from the Arroyo Chasicó Formation dating from the Chasicoan period, and teeth from the Laventan-aged Quebrada Honda Fauna of Bolivia
Paratrigodon
Extinct genus of ground sloths
Magdalenabradys is an extinct genus of mylodontid ground sloths that lived during the Middle Miocene and Early Pliocene of what is now Colombia and Venezuela
Magdalenabradys
Extinct genus of cingulates
Vassallia is an extinct genus of cingulate belonging to the family Pampatheriidae. It lived between the Middle Oligocene and the Early Pliocene in what
Vassallia
Extinct genus of reptiles
Hesperogavialis is an extinct genus of gryposuchine gavialid. Fossils have been found from Venezuela and Brazil that date back to the Middle to Late Miocene
Hesperogavialis
Extinct genus of ground sloths
Mcdonaldocnus is an extinct genus of nothrotheriid ground sloths that lived during the Middle Miocene and Early Pliocene of what is now Bolivia and Argentina
Mcdonaldocnus
Extinct genus of notoungulates
high crowned teeth. The described species is differentiated from the Chasicoan to Colloncuran genus Protypotherium in having more open lingual enamel
Miocochilius
Extinct genus of ground sloths
Chasicobradys Temporal range: Late Miocene (Chasicoan) ~10–9 Ma PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification Kingdom: Animalia Phylum: Chordata
Chasicobradys
Geologic formation in western Patagonia
Lujanian Ensenadan Marplatan Chapadmalalan Montehermosan Huayquerian Chasicoan Mayoan Laventan Colloncuran Friasian Santacrucian Colhuehuapian Deseadan
Río_Frías_Formation
Extinct genus of reptiles
Globidentosuchus is an extinct genus of basal caimanine crocodylian known from the late Middle to Late Miocene of the Middle and the Upper Members of the
Globidentosuchus
Extinct genus of mammals
Neotamandua is an extinct genus of anteaters that lived in the Miocene to Pliocene in South America. Their fossils have been found in the Miocene Collón
Neotamandua
Extinct genus of ground sloths
Pattersonocnus is an extinct genus of megalonychid sloth that lived during the Miocene in Venezuela 11.6 million years ago. The genus contains one known
Pattersonocnus
Extinct species of bird
Leptoptilos patagonicus Temporal range: Late Miocene (Chasicoan) ~9.41 Ma PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification Kingdom: Animalia Phylum:
Leptoptilos_patagonicus
Cardiomys leufuensis Sp. nov Valid Pérez, Deschamps & Vucetich Late Miocene (Chasicoan) Arroyo Chasicó Formation Argentina A relative of the capybara. Cavia
2017_in_paleomammalogy
Sedimentary formation in Chile
Lujanian Ensenadan Marplatan Chapadmalalan Montehermosan Huayquerian Chasicoan Mayoan Laventan Colloncuran Friasian Santacrucian Colhuehuapian Deseadan
Abanico_Formation
cercanaxius. Psilopterus colzecus Valid Sp. nov. Tonni & Tambussi Late Miocene Chasicoan Arroyo Chasicó Formation Argentina A Psilopterinae Phorusrhacidae. Sula
1988_in_paleontology
Fossil locality in Colombia
Lujanian Ensenadan Marplatan Chapadmalalan Montehermosan Huayquerian Chasicoan Mayoan Laventan Colloncuran Friasian Santacrucian Colhuehuapian Deseadan
La_Venta_(Colombia)
Geologic timescale for prehistoric South American fauna
glaciations started to form in Antarctica. 34–9 Ma – Tinguirirican to Chasicoan - South America had no land connections to any other continent. 9–3 Ma
South American land mammal age
South_American_land_mammal_age
Extinct genus of turtles
Alajuela Formation, earliest Clarendonian, Panama Urumaco Formation, Chasicoan, Venezuela Carbonemys Stupendemys Bairdemys at Fossilworks.org Bairdemys
Bairdemys
Extinct genus of notoungulates
Paedotherium Temporal range: Late Miocene-Late Pliocene (Chasicoan-Uquian) ~10–1.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N Skull of Paedotherium Scientific classification
Paedotherium
Extinct genus of litopterns
Diadiaphorus is an extinct genus of litoptern mammal from the Miocene of Argentina (Ituzaingó, Pinturas, Chiquimil and Santa Cruz Formations) and Bolivia
Diadiaphorus
a species of Balbaroo. Contrerascynus Nom. nov Valid Mones Miocene (Chasicoan) Loma de las Tapias Formation Argentina A hathlyacynid sparassodont; a
2014_in_paleomammalogy
Extinct genus of ground sloths
Neonematherium Temporal range: Early Miocene-Late Miocene (Friasian-Chasicoan) ~16.3–7.0 Ma PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification Kingdom:
Neonematherium
Extinct genus of notoungulates
Tremacyllus Temporal range: Late Miocene-Late Pleistocene (Chasicoan-Lujanian) ~7–0.012 Ma PreꞒ Ꞓ O S D C P T J K Pg N Skull of Tremacyllus Scientific
Tremacyllus
Peltephilidae (Mammalia: Xenarthra: Cingulata) from the late Miocene (Chasicoan SALMA) of Argentina" (PDF). Zootaxa. 3359: 55–64. doi:10.11646/zootaxa
2012_in_paleomammalogy
Extinct genus of litopterns
Brachytherium Temporal range: Late Miocene-Late Pliocene (Chasicoan-Chapadmalalan) ~10.0–3.0 Ma PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification
Brachytherium
(2026). Prozaedyus scillatoyanei Sp. nov Valid Barasoain et al. Miocene (Chasicoan) Loma de Las Tapias Formation Argentina An armadillo belonging to the
2020_in_paleomammalogy
Extinct genus of ground sloths
Urumacocnus is an extinct genus of megalonychid sloth that lived during the Miocene in Venezuela. The genus contains one known species, Urumacocnus urbanii
Urumacocnus
Extinct genus of litopterns
Neobrachytherium Temporal range: Late Miocene-Late Pliocene (Chasicoan-Chapadmalalan) 9–4 Ma PreꞒ Ꞓ O S D C P T J K Pg N Partial skull of Neobrachytherium
Neobrachytherium
Sedimentary basin in Colombia
Late Miocene Montehermosan Late Miocene Mid Miocene Huayquerian Hiatus Chasicoan Mayoan Laventan Mid Miocene Colloncuran Castilletes Fm. 440 m (1,440 ft)
Cocinetas_Basin
CHASICOAN
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