# Mustersan

The Mustersan age is a period of geologic time (48.0–42.0 Ma) within the Eocene epoch of the Paleogene, used more specifically within the South American land mammal age (SALMA) classification. It follows the Casamayoran and precedes the Divisaderan age.

## Etymology

This age is named after Lake Musters in the Golfo San Jorge Basin.

## Formations

| Formation bold is type | Country | Basin |
| Sarmiento Formation | Argentina | Golfo San Jorge Basin |
| Abanico Formation | Chile | Abanico Basin |
| Andesitas Huancache Formation | Argentina | Golfo San Jorge Basin |
| Chota Formation | Peru | Bagua Basin |
| Geste Formation | Argentina | Puna Plateau |
| Paracas Formation | Peru | Pisco Basin |
| Pozo Formation | Peru | Ucayali Basin |
| Soncco Formation | Peru | Eastern Peruvian Andes |
| Vaca Mahuida Formation | Argentina | Neuquén Basin |
| Ventana Formation | Argentina | Neuquén Basin |
| Yahuarango Formation - Santa Rosa fauna | Peru | Ucayali Basin |

## Fossils

| Group | Fossils | Formation | Notes |
| Mammals | Antepithecus brachystephanus, Guilielmoscottia plicifera, Kramadolops mayoi, Propyrotherium saxeum, Pseudhyrax eutrachytheroides, Eomorphippus sp. | Sarmiento | |
| Mammals | Chlorocyon phantasma, Ignigena minisculus, aff. Ernestokokenia sp., Borhyaenidae indet., Oldfieldthomasiidae indet. | Abanico | |
| Mammals | Archaeopithecus cf. rogeri, Asmithwoodwardia subtrigona, Bardalestes hunco, Gashternia ctalehor, Greniodon sylvaticus, Henricosbornia lophodonta, Homalostylops parvus, Palangania cf. brandmayri, Polydolops rothi, P. unicus, Prostegotherium cf. astrifer, Amphidolops sp., Marmosopsis sp., Notostylops sp., Pauladelphys sp., Protodidelphis sp., Riostegotherium sp., Stegosimpsonia sp., Borhyaeninae indet., Caroloameghiniinae indet., Hathlyacininae indet. | Andesitas Huancache | |
| Mammals | Antofagastia turneri, Bonapartherium serrensis, Parastegosimpsonia cf. peruana, Parutaetus punaensis, Prostegotherium notostylopianum, Pucatherium parvum, Punadolops alonsoi, Punahyrax bondesioi, Punapithecus minor, Punatherium catamarquensis, Reigia punae, Suniodon catamarcensis, Astegotherium sp., Callistoe sp., Colbertia sp., cf. Ernestokokenia sp., cf. Pampahippus sp., Propyrotherium sp., cf. Utaetus sp., Astrapotheriidae indet., Interatheriidae indet., Isotemnidae indet., Litopterna indet., Notohippidae indet., Notostylopidae indet., Notoungulata indet., Oldfieldthomasiidae indet., Typotheria indet. | Geste | [25][26] [27][28] |
| Mammals | Eobranisamys riverai, E. romeropittmanae, Eodelphomys almeidacomposi, Eoespina woodi, Eoincamys ameghinoi, E. pascuali, Eopicure kraglievichi, Eopululo wigmorei, Eosachacui lavocati, Eosallamys paulacoutoi, E. simpsoni, Hondonadia pittmanae, Incadolops ucayali, Kirutherium paititiensis, Kiruwamaq chisu, Micoureus laventicus, Parastegosimpsonia peruana, Patene campbelli, Perulestes cardichi, P. fraileyi, Perupithecus ucayaliensis, Rumiodon inti, Sasawatsu mahaynaq, Wamradolops tsullodon, Wirunodon chanku, Yuruatherium tropicalis, Guiomys sp., Scleromys sp., Sipalocyon sp., cf. Microsteiromys sp., Acaremyidae indet., Chiroptera indet., ?Gondwanatheria indet., Glyptodontinae indet., Hystricognatha indet., Interatheriinae indet., cf. Notohippidae indet. | Yahuarango | [29][30] [31][32] |
| Birds | Perudyptes devriesi | Paracas | |
| Birds | Psilopteridae indet. | Sarmiento | |
| Birds | Presbyornithidae indet. | Vaca Mahuida | |
| Reptiles & amphibians | Boidae indet., Sebecidae indet., Testudines indet. | Geste | |
| Reptiles & amphibians | Shelania laurenti | Vaca Mahuida | |
| Reptiles & amphibians | Boinae indet. | Sarmiento | |
| Insects | Acanthocephalonotum martinsnetoi, Archimyrmex piatnitzkyi, A. smekali, Madres delpueblo, ?Atalophlebia sp., Stratiomyidae indet. | Ventana | [35][36] [37] |
| Flora | Agathis zamunerae, Atherospermophyllum guinazui, Embothrium precoccineum , ?Embothrium pregrandiflorum, Fagus subferruginea, Lomatia preferruginea, Retrophyllum spiralifolium, Blechnum sp. | Ventana | [17][38] [39][40] |