# Casamayoran

The Casamayoran (Spanish: Casamayorense) age is a period of geologic time (50.0–48.0 Ma) within the Early Eocene epoch of the Paleogene, used more specifically within the South American land mammal age (SALMA) classification. It follows the Itaboraian and precedes the Mustersan age.
Several astrapotherian mammals are known from this period, such as Antarctodon and Albertogaudrya from Antarctica and Argentina, respectively. Albertogaudrya and Scaglia were the size of a sheep or a small tapir, hence among the larger mammals in South America at this time.

## Etymology

This age is named after the Casamayor Formation of the Golfo San Jorge Basin.

## Formations

| Formation bold is type | Country | Basin |
| Casamayor Formation | Argentina | Golfo San Jorge Basin |
| Abanico Formation | Chile | Abanico Basin |
| Bogotá Formation | Colombia | Altiplano Cundiboyacense |
| Cayara Formation | Bolivia | Cochabamba Department |
| Chota Formation | Peru | Bagua Basin |
| Los Cuervos Formation | Colombia | Cesar-Ranchería Basin |
| Fonseca Formation | Brazil | Fonseca Basin |
| Huitrera Formation | Argentina | Neuquén Basin |
| Laguna del Hunco Formation | Argentina | Cañadón Asfalto Basin |
| Lumbrera Formation | Argentina | Salta Basin |
| Maíz Gordo Formation | Argentina | Salta Basin |
| Quebrada de los Colorados Formation | Argentina | Salta Basin |
| Sarmiento Formation | Argentina | Golfo San Jorge Basin |

## Fossils

| Group | Fossils | Formation | Notes |
| Mammals | Florentinoameghinia mystica, Notopithecus adapinus, Notostylops murinus, Thomashuxleya sp., Trigonostylops sp., cf. Pleurostylodon sp. | Casamayor | |
| Mammals | Antepithecus brachystephanus | Abanico | |
| Mammals | cf. Camargomendesia indet. | Cayara | |
| Mammals | Bonapartherium hinakusijum, Boreastylops lumbrerensis, Callistoe vincei, Campanorco inauguralis, Colbertia lumbrerense, Coquenia bondi, Dolichostylodon saltensis, Griphotherion peiranoi, Indalecia grandensis, Lumbreratherium oblitum, Pampahippus arenalesi, P. secundus, Pampatemnus deuteros, P. infernalis, Patene simpsoni, Prepidolops didelphoides, P. molinai, ?Albertogaudrya carahuasensis, Borhyaenoidea sp. | Lumbrera | [25][26] [27][28] [29][30] [31][32] [33][34] [35][36] |
| Mammals | Coloradolops cardonensis, Pampahippus powelli, Prostegotherium sp., cf. Utaetus sp., Dasypodidae indet., Leontiniidae indet., Toxodontia indet. | Quebrada de los Colorados | [37] [38][39] [40] |
| Mammals | Acropithecus rigidus, Adiantoides magnus, Amphidolops serrula,Anisolambda amel, A. fissidens, Asmithwoodwardia subtrigona, Coona gutierrezi, C. pattersoni, Didolodus minor, Edvardotrouessartia sola, Florentinoameghinia mystica, Henricosbornia lophodonta, Ideodelphys microscopicus, Isotemnus primitivus, Josepholeidya adunca, Maxschlosseria consumata, M. minuta, Notopithecus adapinus, Notostylops appressus, N. pendens, Pleurostylodon similis, Polydolops serra, P. thomasi, Ricardolydekkeria cf. praerupta, Scaglia kraglievichorum, Sparnotheriodon epsilonoides, Thomashuxleya externa, Transpithecus obtentus, Trigonostylops ?wortmani, Homalostylops sp., Patene sp., Albertogaudrya indet., Didolodontidae indet., Prostegotherium indet., Victorlemoinea indet. | Sarmiento | [41][42] [43][44] [45] |
| Birds | Telmabates antiquus, T. howardae | Sarmiento | |
| Reptiles & amphibians | Loricata indet. | Cayara | |
| Reptiles & amphibians | Pelomedusoides indet. | Los Cuervos | |
| Reptiles & amphibians | Llankibatrachus truebae | Huitrera | |
| Reptiles & amphibians | Shelania pascuali | Laguna del Hunco | |
| Reptiles & amphibians | Ayllusuchus fernandezi, Lumbrerasaurus scagliai, Sebecus sp., Sebecosuchia indet. | Lumbrera | |
| Reptiles & amphibians | Crocodylia indet., Testudinata indet. | Quebrada de los Colorados | |
| Reptiles & amphibians | Chubutophis grandis, Gaffneylania auricularis, Niolamia argentina, Sebecus icaeorhinus, Waincophis australis | Sarmiento | [50] [41][42] [51] |
| Fishes | Erythrinidae indet., Serrasalmidae indet., Siluriformes indet. | Cayara | |
| Fishes | cf. Carcharodon auriculatus, Carcharodon sp. | Casamayor | |
| Fishes | Bachmannia chubutensis | Laguna del Hunco | |
| Fishes | Gymnogeophagus eocenicus, Lepidosiren paradoxa, Proterocara argentina | Lumbrera | |
| Insects | Duartia pulchella, Fonsecablatta patricioi, Fonsecacarabus placidus, Fonsecacicada mineira, Fonsecadalia perfectus, F. propinquus, Fonsecahymen stigmata, Spargotermes costalimai, Auchenorrhyncha indet., Curculionidae indet. | Fonseca | [56][57] [58][59] |
| Insects | Catogenus punctatus, Inacayalestes aikunhuapi | Huitrera | |
| Molluscs | Gibbula dalli, Jorgechlamys centralis, Ostrea ingens, Pecten proximus, Scalaria rugulosa, Turritella breantania | Casamayor | |
| Brachiopods | Magellania lenticularis, Plicirhynchia plicigera, Tegulorhynchia squamosa, Terebratella dorsata, T. patagonica | Casamayor | |
| Echinoids | Hypechinus patagonensis, Iheringiella patagonensis, Isechinus (Toxopneustes) praecursor, Linthia gaudryii, Platypygus (Cyrthoma) posthumus, Psammechinus iheringi, P. tournoueri, Schizaster ameghinoi | Casamayor | |
| Pollen | Diporisporites elongatus, Gabonisporis vigourouxii, Jussitriporites menendezii, Liquidambarpollenites cf. brandonensis, Podocarpidites cf. marwickii, Retitriletes austroclavatidites, Smilacipites saltensis, Tricolpites lumbrerensis, T. cf. reticulatus, T. vulgaris, Verrustephanoporites simplex, Baculatisporites sp., Diporicellaesporites sp., Inapertisporites sp., Inaperturopollenites sp., Laevigatosporites sp., Nothopollenites sp., Pluricellaesporites sp., Rhoipites sp. | Lumbrera | |