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

The Divisaderan is named after the Divisadero Largo Formation of Divisadero Largo, Mendoza, Argentina. It was originally distinguished by an unusual combination of archaic mammals and more recent-looking notoungulate fossils. However, more recent studies argue that the distinctive notoungulates reported from the Divisadero Largo Formation may actually be sourced from the younger (Miocene-age) Mariño Formation. Without these fossils, the Divisaderan may be too poorly-distinguished to stay in use compared to other middle-late Eocene SALMAs.

Formations

Formation Country Basin Notes Divisadero Largo Formation Cuyo Basin Abanico Formation Abanico Basin Andesitas Huancache Formation Golfo San Jorge Basin Chota Formation Bagua Basin Guabirotuba Formation Curitiba Basin Leticia Formation Austral Basin Loreto Formation Magallanes Basin Paracas Group Pisco Basin Pozo Formation Ucayali Basin Sarmiento Formation Golfo San Jorge Basin Soncco Formation Eastern Peruvian Andes Yumaque Formation 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. DivisaderoLargo 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. DivisaderoLargo ?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

References

Bibliography General

Divisadero Largo Formation

Abanico Formation

Andesitas Huancache Formation

Chota Formation

Guabirotuba Formation

Leticia Formation

Loreto Formation

Paracas Group

Pozo Formation

Sarmiento Formation

Soncco Formation

Yumaque Formation