Divisaderan

The Divisaderan age is a South American land mammal age, covering a period of geologic time (42.0–36.0 Ma) within the Middle and Late Eocene epochs of the Paleogene. It follows the Mustersan age and is followed by the Tinguirirican age.

Etymology

The age is named after the Divisadero Largo Formation of Divisadero Largo, Mendoza, Argentina.

Formations

Formation
bold is type
Country Basin Notes
Divisadero Largo Formation Argentina Cuyo Basin
Abanico Formation Chile Abanico Basin
Andesitas Huancache Formation Argentina Golfo San Jorge Basin
Chota Formation Peru Bagua Basin
Guabirotuba Formation Brazil Curitiba Basin
Leticia Formation Argentina Austral Basin
Loreto Formation Chile Magallanes Basin
Paracas Group Peru Pisco Basin
Pozo Formation Peru Ucayali Basin
Sarmiento Formation Argentina Golfo San Jorge Basin
Soncco Formation Peru Eastern Peruvian Andes
Yumaque Formation Peru Pisco Basin

Fossils

Group Fossils Formation Notes
Mammals Acamana ambiguus, Adiantoides leali, Allalmeia atalaensis, Brachystephanus postremus, Groeberia minoprioi, G. pattersoni, Phoradiadius divortiensis, Xenostephanus chiottii, Trigonostylops sp., ?Notoungulata indet. Divisadero
Largo
Proeocoleophorus carlinii, Machlydotherium sp., Meteutatus sp., Nemolestes sp., Parutaetus sp., Utaetus sp., Argyrolagoidea indet., Astegotheriini indet., Astrapotheria indet., Euphractinae indet., Notopithecidae indet., Oldfieldthomasiidae indet., Palaeothentoidea indet. Guabirotuba
Ocucajea picklingi, Supayacetus muizoni, Basilosauridae indet. Paracas

Cachiyacuy contamanensis, C. kummeli, Canaanimys maquiensis, Eobranisamys javierpradoi, Eocoleophorus glyptodontoides, Pozomys ucayaliensis, Pseudostegotherium chubutanum, cf. Eoespina sp., cf. Griphodon sp., cf. Perulestes sp., Rumiodon sp., Sasawatsu sp., Stegosimpsonia sp., ?Trigonostylops sp., Wamradolops sp., Archaeohyracidae indet., Bonapartherioidea indet., Borhyaenidae indet., Chinchilloidea indet., Cingulata indet., Didelphimorphia indet., Interatheriinae indet., Litopterna indet., Microchiroptera indet., Molossidae indet., Phyllostomatidae indet., Polydolopimorphia indet., ?Sudamericidae indet., Toxodontia indet. Pozo


Pseudocladosictis determinabile, Patene coluapiensis, Angelocabrerus daptes, Arminiheringia auceta, Caroloameghinia mater, C. tenuis, Coona gaudryi, Rosendolops primigenium, Polydolops crassus, P. serra, P. thomasi, Amphidolops serrula, Eudolops tetragonus, Pseudolops princeps, Progarzonia notostylopense, Ideodelphys microscopicus, Tonostylops spissus, Thomashuxleya rostrata, Coelostylodon caroloameghinoi, C. florentinoameghinoi, Acoelohyrax complicatissimus, Isotemnus colhuehuapiensis, I. primitivus, Anisotemnus distentus, Pleurostylodon crassiramis, P. modicus, P. similis, Homalostylops parvus, Notostylops bicinctus, N. murinus, Isostylops fretus, Catastylops deflexus, Eohyrax isotemnoides, E. praerusticus, Archaeopithecus fossulatus, A. rogeri, Maxschlosseria consumata, Oldfieldthomasia debilitata, O. parvidens, O. transversa, Ultrapithecus rutilans, Paginula parca, Transpithecus obtentus, Antepithecus brachystephanus, A. innexus, Notopithecus adapinus, Henricosbornia ?lophodonta, Acoelodus proclivus, Proectocion argentinus, P. precisus, Didolodus magnus, D. minor, D. multicuspis, Paulogervaisia inusta, P. mamma, P. porca, Ernestokokenia nitida, Albertogaudrya unica, ?Trigonostylops duplex, T. wortmani, Parutaetus chicoensis, P. clusus, P. signatus, Meteutatus percarinatus, Pseudostegotherium chubutanum, Prostegotherium astrifer, P. notostylopianum, Utaetus buccatus, U. deustus, U. lenis, Machlydotherium sparsum, Rutimeyeria conulifera Guilielmofloweria plicata, Anisolambda fissidens, Proplanodus adnepos, Periphragnis exauctus, Mazzoniphractus ingens Sarmiento

Mystacodon selenensis Yumaque
Reptiles &
amphibians
Cunampaia simplex, Ilchunaia parva, Barinasuchus sp. Divisadero
Largo
?Balanerodus sp., cf. Sebecus sp., Anilioidea indet., Anura indet., Booidea indet., Caimaninae indet., ?Chelidae indet., Gavialoidea indet., Pipidae indet., ?Platynota indet. Pozo
Eocaiman cavernensis, ?Boa sp., ?Madtsoia sp., Crocodylomorpha indet. Sarmiento
Birds Spheniscidae indet. Loreto
Fishes Ischyodus dolloi, Striatolamia macrota, Elasmobranchii indet. Loreto
Potamotrygon ucayalensis, ?Colossoma sp., cf. Leporinus sp., cf. Hydrolycus sp., Actinopterygii indet., Characiformes indet. Pozo

Flora Chara (Grambastichara) tornata, Nitellopsis (Tectochara) latispira Pozo