The Casamayoran (es|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.[1]
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.[2]
This age is named after the Casamayor Formation of the Golfo San Jorge Basin.
| Formation | Country | Basin | class=unsortable | Notes |
|---|---|---|---|---|
| Casamayor Formation | ||||
| Group | Fossils | Formation | class=unsortable | Notes |
|---|---|---|---|---|
| Mammals | Florentinoameghinia mystica, Notopithecus adapinus, Notostylops murinus, Thomashuxleya sp., Trigonostylops sp., cf. Pleurostylodon sp. | |||
| Antepithecus brachystephanus | ||||
| cf. Camargomendesia indet. | ||||
| 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. | ||||
| Birds | Telmabates antiquus, T. howardae | |||
| Reptiles &<br />amphibians | ||||
| Llankibatrachus truebae | ||||
| Shelania pascuali | ||||
| Chubutophis grandis, Gaffneylania auricularis, Niolamia argentina, Sebecus icaeorhinus, Waincophis australis | ||||
| Fishes | ||||
| cf. Carcharodon auriculatus, Carcharodon sp. | ||||
| Bachmannia chubutensis | ||||
| Gymnogeophagus eocenicus, Lepidosiren paradoxa, Proterocara argentina | ||||
| Insects | ||||
| Catogenus punctatus, Inacayalestes aikunhuapi | ||||
| Molluscs | Gibbula dalli, Jorgechlamys centralis, Ostrea ingens, Pecten proximus, Scalaria rugulosa, Turritella breantania | |||
| Brachiopods | Magellania lenticularis, Plicirhynchia plicigera, Tegulorhynchia squamosa, Terebratella dorsata, T. patagonica | |||
| Echinoids | Hypechinus patagonensis, Iheringiella patagonensis, Isechinus (Toxopneustes) praecursor, Linthia gaudryii, Platypygus (Cyrthoma) posthumus, Psammechinus iheringi, P. tournoueri, Schizaster ameghinoi | |||
| 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. | |||