# Sarmiento Formation

The Sarmiento Formation (Spanish: Formación Sarmiento), in older literature described as the Casamayor Formation, is a geological formation in Chubut Province, Argentina, in central Patagonia, which spans around 30 million years from the mid-Eocene to the early Miocene. It predominantly consists of pyroclastic deposits, which were deposited in a semi-arid environment. It is divided up into a number of members. The diverse fauna of the Sarmiento Formation, including a variety of birds, crocodilians, turtles and snakes, also includes many mammals such as South American native ungulates (notoungulates, litopterns, astrapotheres) as well as armadillos, and caviomorph rodents.

## Paleofauna
### Amphibians

| Name | Species | Member/Locality | Notes |
| Anura indet. | Currently undescribed | Upper Puesto Almendra Member | |
| Calyptocephalella | C. canqueli | Upper Puesto Almendra Member | A calyptocephalellid frog |
| Eupsophus | E. sp. | Upper Puesto Almendra Member | An alsodid frog |
| Neoprocoela | N. edentatus | Upper Puesto Almendra Member | A leptodactylid frog |

### Birds

| Name | Species | Member/Locality | Notes |
| Andrewsornis | A. abotti | Upper Puesto Almendra Member | A phorusrhacid |
| Loxornis | L. clivus | Upper Puesto Almendra Member | |
| Physornis | P. sp. | Upper Puesto Almendra Member | A phorusrhacid |
| Telmabates | T. antiquus | Upper Puesto Almendra Member | A presbyornithid |

### Reptiles
#### Crocodylomorphs

| Name | Species | Member/Locality | Material | Notes | Image |
| Eocaiman | E. cavernensis | Gran Barranca Member | | A caiman | |
| Sebecus | S. icaeorhinus | Gran Barranca Member | Disarticulated skull, mandible, and some postcranial material. | A sebecid notosuchian. | |

#### Lepidosaurs

| Name | Species | Member/Locality | Notes |
| Chubutophis | C. grandis | Gran Barranca Member | A boa snake |
| Gaimanophis | G. tenuis | Trelew Member | A boa snake |
| Iguanidae indet. | Currently undescribed | Upper Puesto Almendra Member | |
| Madtsoia | M. bai M. sp. | Gran Barranca and Upper Puesto Almendra Members | A madtsoiid snake |
| Waincophis | W. australis | Gran Barranca Member | A boa snake |

#### Testudines

| Name | Species | Member | Notes |
| Chelonoidis | C. gringorum | Trelew Member | A tortoise |
| Gaffneylania | G. auricularis | | A meiolaniid stem-turtle |
| Niolamia | N. argentina | Gran Barranca Member | A meiolaniid stem-turtle |
| Testudininae indet. | Currently undescribed | Puesto Almendra Member | A tortoise |

### Mammals
#### Meridiolestidans

| Name | Species | Member/Locality | Material | Notes | Image |
| Necrolestes | N. mirabilis | Colhué Huapí Member | | Youngest known meridiolestidan | |

#### Meridiungulates

| Name | Species | Member/Locality | Material | Notes |
| Acoelodus | A proclivus | Gran Barranca Member | | A notoungulate of uncertain affinities. |
| Acoelohyrax | A. sigma A. complicatissimus | Gran Barranca Member | | A notohippid notoungulate |
| Adiantoides | A. magnus | Gran Barranca Member | | An indaleciid litoptern |
| Albertogaudrya | A. carahuasensis A. unica | Gran Barranca Member | | An astrapothere |
| Amilnedwardsia | A. brevicula | Gran Barranca Member | | |
| Ancylocoelus | A. frequens | Puesto Almendra Member | | A leontiniid notoungulate |
| Anisolambda | A. amel A. fissidens | Gran Barranca Member | | A proterotheriid litoptern |
| Anisotemnus | A. distentus | Gran Barranca and Vera Members | | An isotemnid notoungulate |
| Antepithecus | A. brachystephanus A. innexus | Gran Barranca and Rosado Members | | A notopithecid notoungulate |
| Archaeohyrax | A. patagonicus | Gran Barranca and Puesto Almendra Members | | A archaeohyracid notoungulate |
| Archaeophylus | A. patrius | Puesto Almendra Member | | A interatheriid notoungulate |
| Archaeopithecus | A. rogeri | Gran Barranca Member | | A archaeopithecid notoungulate |
| Archaeotypotherium | A. propheticus | Puesto Almendra and Vera Members | | An archaeohyracid notoungulate |
| Argyrohippus | A. boulei A. fraterculus A. praecox | Colhué Huapí and Puesto Almendra Members | | |
| Argyrohyrax | A. proavus | Puesto Almendra Member | | |
| Asmodeus | A. osborni | Puesto Almendra Member | | |
| Astraponotus | A. assymmetrus A. dicksoni A. dilatatus A. holdichi A. thompsoni | Gran Barranca Member | | |
| Astrapotherium | A. ruderarium | Colhué Huapí member | | |
| Astrapotheriidae indet. | Currently undescribed | Colhué Huapí Member | | |
| Bryanpattersonia | B. sulcidens | Puesto Almendra and Vera Members | | Genus probably a synonym of Archaeotypotherium |
| Cochilius | C. brevirostris C. fumensis C. volvens | Colhué Huapí and Puesto Almendra Members | | |
| Colpodon | C. distinctus C. propinquus C. sp. | Colhué Huapí Member | | A leontiniid. |
| Coniopternium | C. andinum | Puesto Almendra Member | | A macraucheniid litoptern |
| Cramauchenia | C. normalis | Colhué Huapí and Puesto Almendra Members | Nearly complete skull and humerus | A macraucheniid litoptern |
| Cramaucheniinae indet. | Currently undescribed | Puesto Almendra Member | | |
| Deuterotherium | D. distichum | Puesto Almendra Member | | |
| Didolodus | D. multicuspsis D. magnus D. minor D. latigonus | Gran Barranca and Rosado Members | All species mostly known from dental remains | A didolodontid. |
| Edvardotrouessartia | E. sola | Gran Barranca Member | | |
| Eohyrax | E. isotemnoides E. platyodus E. praerusticus | Gran Barranca and Rosado Members | | |
| Eolicaphrium | E. primarium | Gran Barranca Member | | A litoptern |
| Eomorphippus | E. bondi E. neilopdykei E. obscurus | Rosado and Lower Puesto Almendra members | | A notohippid notoungulate |
| Eopachyrucos | E. pliciformis E. pliciferus | Rosado and Puesto Almendra Members | Mandibular and skull remains | An interatheriid. |
| Ernestohaeckelia | E. aculeata E. acutidens | Gran Barranca Member | | A litoptern |
| Ernestokokenia | E. nitida E. patagonica | Gran Barranca Member | Mostly known from dental remains | A didolodontid. |
| Eurygenium | E. latirostris | Puesto Almendra Member | | A notohippid notoungulate |
| Guilielmofloweria | G. plicata | Gran Barranca Member | | A proterotheriid. |
| Guilielmoscottia | G. plicifera | Rosado and Vera Members | | A interatheriid notoungulate |
| Hegetotheriopsis | H. sulcatus | Trelew Member | | |
| Hegetotherium | H. novum | Trelew Member | | A hegetotheriid notoungulate |
| Homalostylops | H. atavus H. parvus | Gran Barranca and Rosado Members | | A notostylopid notoungulate |
| Henricofilholia | H. lustrata H. cingulata H. circumdata H. intercincta H. vucetichia | Upper Puesto Almendra Member | | An astrapothere |
| Henricosbornia | H. ampla H. lophodonta H. minuta | Gran Barranca Member | | |
| Interatherium | I. sp. | Colhué Huapí Member | | An interatheriid |
| Isotemnus | Isotemnus ctalego Isotemnus haugi Isotemnus latidens Isotemnus primitivus | Gran Barranca Member | | |
| Isotemnidae indet. | Currently undescribed | Puesto Almendra Member | | |
| Lambdaconus | L. lacerum | Colhué Huapí Member | | |
| Leontinia | L. gaudryi L. sp. | Puesto Almendra Member | | |
| Maddenia | M. lapidaria | Puesto Almendra Member | | |
| Maxschlosseria | M. consumata M. expansa M. minima M. minuta M. praeterita M. rusticula M. septa | Gran Barranca Member | | An oldfieldthomasiid notoungulata |
| Medistylus | M. dorsatus | Puesto Almendra Member | | |
| Morphippus | M. complicatus M. fraternus M. hypselodus M. imbricatus M. quadrilobus | Puesto Almendra Member | | |
| Notopithecus | N. adapinus | Gran Barranca and Rosado Members | | |
| Notostylops | N. murinus N. appressus N. pendens N. pigafettai N. sp. | Gran Barranca and Rosado Members | | |
| Oldfieldthomasia | O. anfractuosa O. debilitata O. parvidens O. transversa | Gran Barranca Member | | |
| Othnielmarshia | O. curviristra O. lacunifera O. reflexa | Gran Barranca Member | | |
| Pachyrukhos | P. sp. | Colhué Huapí Member | | |
| Paginula | P. parca | Gran Barranca Member | | |
| Paramacrauchenia | P. scamnata P. inexspectata | Colhué Huapí Member | | |
| Parastrapotherium | P. cingulatum P. ephebicum P. holmbergi P. lemoinei P. trouessarti P. sp. | Colhué Huapí and Puesto Almendra Members | | |
| Patagonhippus | P. canterensis P. dukei | Puesto Almendra Member | | A notohippid notoungulate |
| Paulogervaisia | P. inusta | Gran Barranca and Rosado Members | | |
| Peripantostylops | P. minutus | Gran Barranca Member | | |
| Periphragnis | P. exauctus P. sp. | Rosado Member | | |
| Pleurostylodon | P. complanatus P. crassiramis P. modicus | Gran Barranca Member | | An isotemnid notoungulate |
| Polymorphis | P. lechei | Gran Barranca Member | | A macraucheniid litoptern |
| Proadiantus | P. excavatus | Puesto Almendra Member | | |
| Proadinotherium | P. leptognathus | Puesto Almendra Member | | A toxodontid notoungulate |
| Proargyrohyrax | P. curanderensis P. sp. | Vera Member | | An interatheriid notoungulate |
| Proectocion | P. argentinus P. precisus | Gran Barranca Member | | An adianthid litoptern |
| Progaleopithecus | P. fissurellatus P. tournoueri P. sp. | Puesto Almendra Member | | A interatheriid notoungulate |
| Prohegetotherium | P. sculptum P. sp. | Puesto Almendra Member | | |
| Proheptaconus | P. patagonicus | Colhué Huapí and Trelew Members | | An adianthid litoptern |
| Prolicaphrium | P. spectabile P. specillatum | Colhué Huapí Member | | A proterotheriid litoptern |
| Propachyrucos | P. smithwoodwardi | Puesto Almendra Member | | |
| Propyrotherium | P. saxeum | Gran Barranca Member | | |
| Prosotherium | P. garzoni | Puesto Almendra Member | | |
| Protarchaeohyrax | P. minor | Puesto Almendra Member | | A archaeohyracid notoungulate |
| Proterotheriidae indet. | Currently undescribed | Puesto Almendra Member | | |
| Protheosodon | P. coniferus | Puesto Almendra Member | | |
| Protypotherium | P. sp. | Colhué Huapí Member | | |
| Pseudhyrax | P. eutrachytheroides | Puesto Almendra Member | | |
| Pternoconius | P. polymorphoides P. tournoueri P. bondi | Colhué Huapí and Puesto Almendra Members | | |
| Puelia | P. sigma P. coarctatus | Gran Barranca, Rosado, and Vera Members | | A notohippid notoungulate |
| Pyrotherium | P. romeroi | Puesto Almendra Member | | |
| Rhynchippus | R. pumilus R. equinus R. sp. | Puesto Almendra Member | | |
| Rosendo | R. pascuali | Vera Member | | A notohippid notoungulate |
| Rutimeyeria | R. conulifera | Gran Barranca Member | | A litoptern |
| Santiagorothia | S. chiliensis | Vera Member | | |
| Scaglia | S. kraglievichorum | Gran Barranca Member | | |
| Scarrittia | S. canquelensis S. barranquensis | Puesto Almendra Member | | |
| Sparnotheriodon | S. epsilonoides | Gran Barranca Member | | |
| Teratopithecus | T. elpidophoros | Gran Barranca Member | | |
| Tetragonostylops | T. apthomasi | Gran Barranca Member | | |
| Tetramerorhinus | T. sp. | Colhué Huapí Member | | |
| Teushentherium | T. camaronensis | Puesto Almendra Member | | |
| Theosodon | T.? frenguellii | Colhué Huapí Member | | |
| Thomashuxleya | T. rostrata | Gran Barranca Member | | An isotemnid notoungulate |
| Trachytherus | T. spegazzinianus T. sp. | Puesto Almendra Member | | |
| Transpithecus | T. obtentus T. sp. | Gran Barranca and Rosado Members | | |
| Tricoelodus | T. bicuspidatus | Puesto Almendra Member | | An adianthid litoptern |
| Trigonolophodon | T. elegans T. inflatus | Puesto Almendra Member | | A homalodotheriid notoungulate |
| Trigonostylops | T. wortmani T. sp. | Gran Barranca Member | | An astrapothere |
| Ultrapithecus | U. rutilans | Gran Barranca and Rosado Members | | |
| Victorlemoinea | V. labyrinthica V. emarginata V. longidens V. sp. | Gran Barranca Member | | |

#### Xenarthrans

| Name | Species | Member/Locality |
| Archaeutatus | A. malaspinensis A. sp. | Upper Puesto Almendra Member |
| Astegotherium | A. dichotomum | Gran Barranca Member |
| Barrancatatus | B. rigidus B. maddeni B. sp. | Vera and Upper Puesto Almendra Members |
| Clypeotherium | C. magnum | Upper Puesto Almendra Members |
| Cochlops | C. sp. | Colhué Huapí Member |
| Glyptodontinae indet. | Currently undescribed | Colhué Huapí and Upper Puesto Almendra Members |
| Hapaloides | H. ignavus H. laeviusculus H. ponderosus H. sp. | Colhué Huapí Member |
| Holomegalonyx | H. menendezi | Colhué Huapí Member |
| Machlydotherium | M. ater M. sparsum M. sp. | Gran Barranca, Rosado, Upper Puesto Almendra, and Vera Members |
| Mazzoniphractus | M. ingens | Rosado Member |
| Megalonychidae indet. | Currently undescribed | Colhué Huapí Member |
| Meteutatus | M. anthinus M. ascendens M. concavus M. confluens M. lagenaformis M. lucidus M. minutus M. nepotulus M. percarinatus M. tortuosus M. sp. | Gran Barranca, Rosado, Upper Puesto Almendra, and Vera Members |
| Nematherium | N. sp. | Colhué Huapí Member |
| Octodontotherium | O. grande O. crassidens | Upper Puesto Almendra Member |
| Palaeopeltis | P. inornatus | Upper Puesto Almendra Member |
| Parutaetus | P. chicoensis P. chilensis P. clusus P. signatus | Gran Barranca, Rosado, Upper Puesto Almendra, and Vera Members |
| Peltephilus | P. pumilus P. undulatus P. sp. | Colhué Huapí and Upper Puesto Almendra Members |
| Peltephilidae indet. | Currently undescribed | Colhué Huapí, Rosado, Upper Puesto Almendra, and Vera Members |
| Proeuphractus | P. setiger | Upper Puesto Almendra Member |
| Proeutatus | P. oenophorum Proeutatus robustus P. sp. | Colhué Huapí Member |
| Propalaehoplophorus | P sp. | Colhué Huapí Member |
| Proplatyarthrus | P longipes | Vera Member |
| Proschismotherium | P. oppositum P. sp. | Colhué Huapí Member |
| Prostegotherium | P. astrifer P. notostylopianum P. sp. | Gran Barranca Member |
| Prozaedyus | P. humilis P. impressus P. planus P. sp. | Colhué Huapí and Upper Puesto Almendra Members |
| Pseudoglyptodon | P. chilensis | Gran Barranca and Upper Puesto Almendra Members |
| Stegosimpsonia | S. chubutanum | Colhué Huapí, Gran Barranca, and Rosado Members |
| Stegotherium | S. caroloameghinoi S. pascuali S. tessellatum S. variegatum | Colhué Huapí Member |
| Stegotheriini indet. | Currently undescribed | Colhué Huapí, Rosado, Upper Puesto Almendra, and Vera Members |
| Stenotatus | S. centralis S. patagonicus S. ornatus S sp. | Colhué Huapí, Upper Puesto Almendra, and Vera Members |
| Utaetus | U. buccatus U. deustus U. laevus U. lenis | Gran Barranca and Rosado Members |

#### Metatherians

| Name | Species | Member/Locality | Notes |
| Abderites | A. meridionalis | Colhué Huapí Member | |
| Abderitidae indet. | Currently undescribed | Colhué Huapí Member | |
| Acdestodon | A. bonapartei | Upper Puesto Almendra Member | |
| Acdestoides | A. praecursor | Upper Puesto Almendra Member | |
| Acrocyon | A. riggsi | Colhué Huapí Member | |
| Acyon | A. tricuspidatus | Colhué Huapí Member | |
| Amphidolops | A. serrula | Gran Barranca Member | |
| Anargyrolagus | A. primus | Trelew Member | |
| Angelocabrerus | A. daptes | Gran Barranca Member | |
| Arctodictis | A. sinclairi | Colhué Huapí Member | |
| Arminiheringia | A auceta | Gran Barranca Member | |
| Australohyaena | A. antiqua | Upper Puesto Almendra Member | |
| Borhyaena | B. macrodonta | Colhué Huapí Member | |
| Caenolestoides | C. miocaenicus | Colhué Huapí Member | |
| Canchadelphys | C. cristata | Vera Member | |
| Carlothentes | C. chubutensis | Upper Puesto Almendra Member | |
| Caroloameghinia | C. mater C. tenuis | Gran Barranca Member | |
| Cladosictis | C. centralis C sp. | Colhué Huapí Member | |
| Clenia | C. minuscula C. brevis | Colhué Huapí and Vera Members | |
| Coona | C. gaudryi C. gutierrezi C. pattersoni | Gran Barranca Member | |
| Didelphimorphia indet. | Currently undescribed | Colhué Huapí Member | |
| Eomicrobiotherium | E. matutinum E. mykerum | Colhué Huapí, Trelew, Upper Puesto Almendra, and Vera Members | |
| Epikhlonia | E. verticalis | Vera Member | |
| Eudolops | E. tetragonus | Gran Barranca Member | |
| Evolestes | E. sp. | Upper Puesto Almendra Member | |
| Gaimanlestes | G. pascuali | Trelew Member | |
| Hathliacynidae indet. | Currently undescribed | Colhué Huapí and Vera Members | |
| Hondonadia | H. fierroensis H. parca H. praecipitia H. pumila | Upper Puesto Almendra and Vera Members | |
| Kramadolops | K. fissuratus K. hernandezi K. maximus K. mayoi | Gran Barranca, Upper Puesto Almendra, and Vera Members | |
| Microbiotherium | M. praecursor M. sp. | Colhué Huapí and Vera Members | |
| Microbiotheriidae indet. | Currently undescribed | Colhué Huapí Member | |
| Nemolestes | N. spalacotherinus | Gran Barranca Member | |
| Notogale | N. mitis | Upper Puesto Almendra Member | |
| Oligobiotherium | O. divisum | Colhué Huapí Member | |
| Patagonia | P. peregrina | Trelew Member | A metatherian of uncertain placement |
| Pachybiotherium | P. acclinum | Colhué Huapí Member | |
| Palaeothentes | P. marshalli P. migueli P. minutus | Colhué Huapí and Upper Puesto Almendra Members | |
| Palaeothentidae indet. | Currently undescribed | Colhué Huapí and Upper Puesto Almendra Members | |
| Parabderites | P. bicrispatus P. minisculus | Colhué Huapí and Upper Puesto Almendra Members | |
| Periakros | P. ambiguus | Vera Member | |
| Pharsophorus | P. lacerans P. tenax | Upper Puesto Almendra Member | |
| Pichiplidae indet. | Currently undescribed | Upper Puesto Almendra and Vera Members | |
| Pilchenia | P. antiqua P. intermedia P. lobata P. lucina | Upper Puesto Almendra and Vera Members | |
| Polydolops | P. crassus P. serra P. tetragonus P. thomasi P. unicus | Gran Barranca Member | |
| Praedens | P. aberrans | Vera Member | |
| Proargyrolagus | P. argentinus | Colhué Huapí Member | |
| Proborhyaena | P. gigantea | Upper Puesto Almendra Member | |
| Procladosictis | P. erecta | Gran Barranca Member | |
| Progarzonia | P. notostylopense | Gran Barranca Member | |
| Pseudothylacynus | P. rectus | Colhué Huapí Member | |
| Rosendolops | R. ebaios R. primigenium | Gran Barranca, Upper Puesto Almendra, and Vera Members | |
| Rosendolopidae indet. | Currently undescribed | Upper Puesto Almendra and Vera Members | |
| Sipalocyon | S. externus S. sp. | Colhué Huapí Member | |
| Stilotherium | S. parvum | Colhué Huapí Member | |
| Thylacosmilidae indet. | Currently undescribed | Colhué Huapí Member | |
| Trelewthentes | T. rothi | Upper Puesto Almendra Member | |

#### Rodents

| Name | Species | Member/Locality |
| Acarechimys | A. leucotheae A. minutissimus A sp. | Colhué Huapí, Puesto Almendra, and Trelew Members |
| Acaremys | A. preminutus A. murinus A. sp. | Colhué Huapí and Trelew Members |
| Asteromys | A. punctus A. sp. | Upper Puesto Almendra Member |
| Australoprocta | A. fleaglei | Trelew Member |
| Banderomys | B. leanzai | Colhué Huapí Member |
| Branisamyopsis | B. australis | Colhué Huapí Member |
| Caviocricetus | C. lucasi | Colhué Huapí and Trelew Members |
| Caviomorpha indet. | Currently undescribed | Upper Puesto Almendra Member |
| Cephalomyidae indet. | Currently undescribed | Upper Puesto Almendra Member |
| Cephalomyopsis | C. hipselodontus | Puesto Almendra and Trelew Members |
| Cephalomys | C. arcidens | Upper Puesto Almendra Member |
| Changquin | C. woodi | Upper Puesto Almendra Member |
| Chinchilloidea indet. | Currently undescribed | Colhué Huapí Member |
| Chubutomys | C. simpsoni C. leucoreios | Trelew and Upper Puesto Almendra Member |
| Deseadomys | D. arambourgi | Puesto Almendra Member |
| Dudumus | D. ruigomezi | Trelew Member |
| Draconomys | D. verai | Puesto Almendra Member |
| Eobranisamys | E sp. | Puesto Almendra Member |
| Eocardiidae indet. | Currently undescribed | Puesto Almendra Member |
| Eosteiromys | E. homogenidens E. segregatus E. sp. | Colhué Huapí and Trelew Members |
| Eoviscaccia | E. australis | Colhué Huapí, Puesto Almendra, and Trelew Members |
| Ethelomys | E. loomisi | Upper Puesto Almendra Member |
| Hypsosteiromys | H. nectus H. axiculus | Colhué Huapí Member |
| Incamys | I. bolivianus I. menniorum | Puesto Almendra Member |
| Leucokephalos | L. zeffiae | Upper Puesto Almendra Member |
| Litodontomys | L chubtensis | Upper Puesto Almendra Member |
| Llitun | L. notuca | Upper Puesto Almendra Member |
| Loncolicu | L. tretos | Upper Puesto Almendra Member |
| Luantus | L. initialis L. minor L. propheticus L. sp. | Colhué Huapí and Trelew Members |
| Neoepiblemidae indet. | Currently undescribed | Colhué Huapí Member |
| Neoreomys | N. pinturensis | Colhué Huapí Member |
| Paradelphomys | P. fissus | Colhué Huapí Member |
| Parasteiromys | P. friantae P. uniformis | Colhué Huapí Member |
| Perimys | P. incavatus P. transversus P. dissimilis P. sp. | Colhué Huapí and Trelew Members |
| Platypittamys | P. brachyodon | Upper Puesto Almendra Member |
| Prospaniomys | P. priscus P. sp. | Colhué Huapí and Trelew Members |
| Prostichomys | P. bowni | Colhué Huapí Member |
| Protacaremys | P. adilos P. avunculus P. prior P. pulchellus P. sp. | Colhué Huapí and Upper Puesto Almendra Members |
| Protadelphomys | P. latus P. sp. | Colhué Huapí and Trelew Members |
| Saremmys | S. ligcura | Colhué Huapí and Trelew Member |
| Scotamys | S. antiquus | Upper Puesto Almendra Member |
| Soriamys | S. gaimanensis S. ganganensis S. sp. | Colhué Huapí and Trelew Members |
| Willidewu | W. estaparius | Trelew Member |
| Vallehermosomys | V mazzonii | Upper Puesto Almendra Member |
| Xylechimys | X. obliquus | Upper Puesto Almendra Member |

#### Primates

| Name | Species | Member/Locality |
| Dolichocebus | D. gaimanensis | Trelew Member |
| Homunculus | H. sp. | Colhué Huapí Member |
| Mazzonicebus | M. almendrae | Colhué Huapí Member |
| Tremacebus | T. harringtoni | Colhué Huapí Member |

#### Bats

| Name | Species | Member/Locality | Material | Notes | Image |
| Mormopterus | M. barrancae M. sp. | Colhué Huapí Member | | | |
| Phyllostominae indet. | Currently undescribed | Colhué Huapí Member | | | |