The Friasian age is a period of geologic time (16.3–15.5 Ma) within the Early Miocene epoch of the Neogene, used more specifically within the SALMA classification of South America. It follows the Santacrucian and precedes the Colloncuran age.Paleo Database: Friasian
Etymology The age is named after the Río Frías Formation in the Aysén Basin, Patagonia, Chile.
Formations
Formation Country Basin Notes Río Frías Formation Aysén Basin Castilletes Formation Cocinetas Basin Cerdas Beds Altiplano Basin Chilcatay Formation Pisco Basin Cura-Mallín Group Cura-Mallín Basin Gran Bajo del Gualicho Formation Colorado Basin Parángula Formation Barinas-Apure Basin Pebas Formation Amazon Basin Río Foyel Formation Patagonian Andes Río Yuca Formation Barinas-Apure Basin
Fossils Group Fossils Formation Notes Mammals Abderites aisenense, A. meridionalis, Alloiomys friasensis, Astrapotherium hesperinum, Borhyaena tuberata, Cladosictis patagonica, Megathericulus friasensis, Microbiotherium tehuelchum, Parabderites bicrispatus, Palaeothentes intermedius, P. lemoinei, P. minutus, Pichipilus halleuxi, Pitheculites rothi, Prothylacinus patagonicus, Prototrigodon rothi, Sipalocyon gracilis, Adinotherium sp., Homalodotherium sp., Neonematherium sp., Nesodon sp., Pachyrukhos sp., Phoenixauchenia sp., ?Propalaehoplophorus sp., Protypotherium sp., Prozaedyus sp., Theosodon sp., Trachytypotherium sp., Platyrrhini indet. Río Frías Lycopsis padillai, ?Hyperleptus sp., Astrapotheriidae, Odontoceti, Mysticeti, Glyptodontidae, Pampatheriidae, Macraucheniidae, Proterotheriidae, Leontinidae, Toxodontidae, Interatheriidae, Megatheriidae, Dinomyidae, Sirenia, Sparassodonta Castilletes Hegetotherium cerdasensis, Juchuysillu arenalesensis, Llullataruca cf. shockeyi, Microtypotherium cf. choquecotense, Protypotherium cf. attenuatum, "Plesiotypotherium" minus, Palyeidodon obtusum, Mcdonaldocnus bondesioi, Borhyaenoidea indet., Euphractini indet., Lagostominae indet., Macraucheniidae indet., Megatheriinae indet., Mesotheriinae indet., Peltephilidae indet., Uruguaytheriinae indet. Cerdas Cerdas in the Paleobiology DatabaseCerdas-Atocha in the Paleobiology Database Adinotherium sp., Peltephilidae indet. Río Yuca Reptiles Chelus colombiana, Chelonoidis sp., cf. Crocodylus sp., cf. Mourasuchus sp., cf. Purussaurus sp., Alligatoridae indet., Boidae indet., Eusuchia indet., Gavialoidea indet., Podocnemididae indet. Castilletes Barinasuchus arveloi Parángula Purussaurus sp. Río Yuca Birds Aves indet. Castilletes Palaeospheniscus bergi, Spheniscidae indet. Río Foyel Fish Megalodon, Characidae, Serrasalmidae, Sciaenidae, Sparidae, Sphyraenidae, Ariidae, Callichthyidae, Doradidae, Pimelodidae, Carcharhinidae, Hemigaleidae, Sphyrnidae, Lamnidae, Otodontidae, Dasyatidae, Myliobatidae, Rhinopteridae, Ginglymostomatidae, Pristiophoridae, Pristidae, Rhynchobatidae, Rhynobatidae, Lepidosirenidae Castilletes Carcharodon hastalis Río Foyel Phractocephalus sp., Platysilurus sp. Río Yuca
References
Bibliography Río Frías Formation
Castilletes Formation
Cerdas Beds
Chilcatay Formation
Cura-Mallín Group
Gran Bajo del Gualicho Formation
Parángula Formation
Pebas Formation
Río Foyel Formation
Río Yuca Formation