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.^[1]

Etymology

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

Formations

Locations of Divisaderan formations

Formation bold is type	Country	Basin	Notes
Divisadero Largo Formation	Argentina	Cuyo Basin	[2]
Abanico Formation	Chile	Abanico Basin	[3][4]
Andesitas Huancache Formation	Argentina	Golfo San Jorge Basin	[5]
Chota Formation	Peru	Bagua Basin	[6][7]
Guabirotuba Formation	Brazil	Curitiba Basin	[8]
Leticia Formation	Argentina	Austral Basin	[9]
Loreto Formation	Chile	Magallanes Basin	[10]
Paracas Group	Peru	Pisco Basin	[11]
Pozo Formation	Peru	Ucayali Basin	[12][13]
Sarmiento Formation	Argentina	Golfo San Jorge Basin	[14][15]
Soncco Formation	Peru	Eastern Peruvian Andes	[16]
Yumaque Formation	Peru	Pisco Basin	[17]

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	[18]
	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	[19][20]
	Ocucajea picklingi, Supayacetus muizoni, Basilosauridae indet.	Paracas	[21][22] [23]
	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	[24] [25][26] [27][28]
	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	[29][30] [31][32]
	Mystacodon selenensis	Yumaque	[33][34]
Reptiles & amphibians	Cunampaia simplex, Ilchunaia parva, Barinasuchus sp.	Divisadero Largo	[18]
	?Balanerodus sp., cf. Sebecus sp., Anilioidea indet., Anura indet., Booidea indet., Caimaninae indet., ?Chelidae indet., Gavialoidea indet., Pipidae indet., ?Platynota indet.	Pozo	[25]
	Eocaiman cavernensis, ?Boa sp., ?Madtsoia sp., Crocodylomorpha indet.	Sarmiento	[29][35]
Birds	Spheniscidae indet.	Loreto	[36]
Fishes	Ischyodus dolloi, Striatolamia macrota, Elasmobranchii indet.	Loreto	[36]
	Potamotrygon ucayalensis, ?Colossoma sp., cf. Leporinus sp., cf. Hydrolycus sp., Actinopterygii indet., Characiformes indet.	Pozo	[25][26] [27]
Flora	Chara (Grambastichara) tornata, Nitellopsis (Tectochara) latispira	Pozo	[37]